I purchased a Dolphin 3 seasons ago, when I found I was vacuuming more than enjoying the pool. I (and my family) love it. It is more expensive and this year I need to replace the drive belts, but the return on the investment has been worth it. I also understand they have some newer units that clean faster and don't have drive belts. I have seen diagnostics new for around $650, which is what I paid. They do a great job picking stuff up, and I use it at night to move my chemicals around, instead of running the pump. Just toss it in and turn it on. Mine came with 2 bags, one for spring clean up with larger particles and one that traps very fine particles. I can't recommend it enough. Thanks.