I've had them before. I loved how solid they were compared to the steps I have now. I had to put my current steps together and I'm actually looking for a new set of steps. I also loved how my young children got to dock on the steps and play in the water either to play, sit or just take a break. They also used it as a home base for pool games.
The things I didn't like was the algae growth and dead space it had created behind the steps. Honestly, I'd pull the steps 2 times a week to clean because a week is too long to go. With very warm weather and water, the algae would grow. This is the only draw back that I could say about these steps other than they need to be weighted down with at least 50lbs+ of weights. The downfall to this is that YOU literally have to get into the pool at end of season to remove these weights as they sit under a lip of the last step. I use to pay my son to get into the cold water and do it for me. These steps will also wear the print off of a vinyl liner from daily use. I'm not sure if a mat under the steps would help with rubbing or not. If the steps are going in the same spot every year, it may not matter to you.
I'd buy the steps again considering all the negatives I wrote. They are solid.