A few things I've experienced. First, I had my Polaris Booster pump motor replaced, last Spring, by my favorite pool guy, for $325, including labor. It would have cost more if the whole pump had needed replacement but only the motor was bad. That was prior to discovering TFP, so now, I would certainly do it myself. I'm getting ready to DIY an Intelliflo VF, once the weather cooperates.
I've had the iRobot Verro 300 since 2007 (or when they came out). It is essentially the Aquabot Turbo T-Jet, perhaps identical, as it is supposed to have been made by Aquabot and re branded for iRobot. It doesn't pick up leaves as well as the Polaris does. You said you don't have much sand/silt issues, but that is my main debris, except for leaves during parts of the year (and of course blowing debris, sand, silt, dog hair, pollen, plant debris year round. My problem is that when the fine collection bag pores get saturated with silt the 'bot no longer has enough umph to make it up the steep incline to my shallow end. It also doesn't make it up the walls very often. Unlike many of the Aquabots the Verro, and probably the T-jet, movement are powered by water, powered by one water pump that also performs the cleaning. I have just recently traded my Verro for an Aquabot Turbo, separate drive motor, and separate water pump that is much more powerful. It makes it up the walls very easily and has no trouble making it up into the shallow end even when the fine bag is saturated with fine silt.
Both are heavy when you first bring them up from the water surface. I'm always a little concerned with my back but have managed to avoid problems that I am aware of. My pumping station is drained, pipes cut, awaiting my putting in new pump and filter so I have a huge collection of sand and silt on bottom of pool. I use Nasty Bags TM, a wonderful alternative to the Aquabot brand, and much less expensive. They even catch the extremely fine silt that makes it through virtually all other bags except for the EZ, disposable Polaris bags. I've been using the Aquabot Turbo, for a week now, changing out the bags every 30 minutes because of so much silt. I've discovered some "new" muscles in my thighs from all the activity taking the 'bot out of water and placing it back in.
My dogs can easily swim over the Polaris hose and the Tracker 4X (vac) hose with no problems but they do get tangled in the Verro/Aquabot cord. I've never had any issues with the 'bot cord getting hung on the 'bot or too twisted as I regularly untwist the cord, daily.
The most valuable thing for me, and the reason I purchased the Verro in the first place is that I can run it when the main pump is not running or can't be run such as now. Also, the cost of running the 'bot is much, much, less than running a main pump (for vac cleaner) or main pump plus booster for pressure cleaner. My plan is to run the Aquabot at night after I put the dogs in and run the Intelliflo on very low setting.
The Polaris is the most hassle free as you put it in and only have to really take it out when you change the bag. The Polaris is very light weight compared to the 'bots and the bag is so much easier to take off and put on. My main issue with Polaris, over the years, has been that no bag or liner is able to contain our extremely fine silt (some as small as DE or smaller) but I have recently purchased the EZ Bag and it appears that it might be the solution. The EZ bags can't be easily reused or cleaned like other "disposable" bags so that is an expensive option, >$2 per bag, if you have to change them out frequently. I'm going to make my own, using plant frost protection sheeting.
BTW.... I highly recommend the SolarBreeze for top skimming. I'm using a Ver. 2 Beta right now and it does a remarkable job of keeping the surface debris cleaned up. I'm not sure if their web sight has updated info on the Ver 2 but I have seen it for sale on one other site. That may be pre order.
If you won't have issues with little people and/or pets getting tangled in the 'bot cord and you are reasonably, physically healthy and strong enough, and you don't have extremely steep slope from deep to shallow, and you don't have tons of sand/silt the T-jet might be okay for you. If you can find one to rent for a day or so that would be great, so you can try it out. Or purchase where they have a "no questions asked" return period that would, also, be a good way to try it out.
gg=alice