I have thepoolcleaner
I don't believe there's a 2 wheel return model.
I bought thepoolcleaner pressure side 4 wheel last year. Here's my review soon after I purchased it (originally on poolforum... copied here).
This is the cleaner that doesn't require a booster pump. My pool is a a 26KGal IG with 1 skimmer, bottom drain, 2 returns and a dedicated cleaner return that was never hooked up. I bought a Hayward 1HP Superpump + Pro Grid 4800 DE filter this year (replaced a 3/4HP and a EX65A Perflex DE filter) as I wanted enough flow for the cleaner.
I went with this cleaner because I didn't want the cost ($150 initial for the pump + ~$75/season in electricity) of a booster pump. I considered a Polaris 360 or a Letro Legend II but after speaking with customer service for all three companies, I came to the conclusion that thepoolcleaner required less pressure/flow than the other models. Customer service at thepoolcleaner was awesome (speak to a really helpful person in SoCal right away). They explained that flow (not pressure) is what's required for the cleaner to operate and actually overnighted me a coupling and a length of hose to measure the flow out of the cleaner return with a 5 gallon bucket (25~30gal/min desired)... How's that for service! I hooked the hose up, found the flow within range and ordered the cleaner.
I plumbed the new filter pump so I can divert the water from the filter either to the returns or the cleaner return. I used 2x2 way valves instead of a 3 way since I wanted to isolate the chlorinator output to the returns only (so the chlorinated water does not flow throught the thepoolcleaner).
Installing the cleaner was simple. It took less than an hour to unpack, assemble and install. With both the valves open 100% (1/2 to returns, 1/2 to cleaner). I get 12 RPMs on the wheels which is on the low end of the recommended range (11-14RPMs), I went ahead and ran the cleaner this way and while the climbing is less effective (get 1~2 feet up the walls), the cleaner still did an awesome job. I got my pump running 3x3hr cycles and the cleaner is pretty much getting around the whole pool per each cycle.
I'll experiment with diverting more flow to the cleaner but after speaking with customer service and looking at the results as is. It's no big deal if the cleaner doesn't climb the walls high. I think I might leave well enough alone.
I've owned an Aquabot Turbo (nothing but headaches) and a Pool Rover Plus (Awesome). There are the good and bad with each type of cleaner. I have a fairly leafy pool and I like the fact that thepoolcleaner "lives" in the pool and cleans 3x/day so the pool is always ready to go. The robotics were better for deep cleaning 1~2x/week. My problem with the pool rover plus was that my wife (petite woman) could not easily lift it out of the pool. To empty the bag on thepoolcleaner is simple.
So here's my update after 1 year... I'm still happy with the poolcleaner. Here are some notes/issues that I've found over this period (keep in mind here in the Northeast our seasons are ~3 months so I'd say my cleaner has had a total of 4 months running time.
General Movement/Cleaning - works like new. gets around the entire pool on a 2~3hr cycle and pretty much picks up everything. The wall climbing is supposed to get better as thepoolcleaner gets older since the threads wear and the vacuum port gets closer to the pool surface. With only ~4 months runtime, there's hardly any wear in the threads.
problems - no real problems... I did make the mistake of leaving the cleaner in the pool all the time... even after I shocked the pool and during opening. While this caused no harm/damage to the cleaner itself, I'm wearing out the bag faster (probably another season or two left).
now the issues...
I mentioned the bag. I don't like how it opens and closes with velcro. The velcro got fouled up with debris and I basically took it off. I went and bought a few blind handles from the hardware store and installed them in place of the velcro and it works like a champ. I think the other units (polaris, hayward) use a plastic zipper setup which I think is better.
My main drain is a bit high and the cleaner got stuck on it once in a while. I got a polaris cover for the main drain and hadn't had a problem since. This would be a problem for just about ALL cleaners.
The robotics with their micro-filter bag indeed do a better job of "polishing" the water. Even with a DE filter. I do notice a slight difference between my old Robotic and thepoolcleaner.
The cleaner has trouble getting around the pool with the solar cover on... kind of expected since the hose floats on the surface and the added friction does introduce drag. So with the solar cover on, there are corners of the pool that don't get cleaned. I got the solar cover last year after thepoolcleaner and realized quickly that the two don't play nicely together.
That all said... since I do leave my cover on now I will probably be retiring/ebaying thepoolcleaner at some point and going with a combination of a robotic and the poolbuster.
So I can recommend thepoolcleaner under these conditions...
make sure you have plenty of flow (notice I said flow, not pressure).
you do not leave the solar cover on
you are OK with taking it out of the pool once in a while (shocking and such)