I own the smaller bio gs by rabbit air,which I use in the bedroom, and was impressed by it's performance. I wanted one to do the rest of the house so I went with minus a2. It's performance is great, circulates the air and gets rid of odors,however I tend to like the bio gs a bit more because it is simpler to use, I don't need the mood light. I live in south florida in a small house ,over 50 years old, along with 3 dogs and I smoke, both these machines work great at getting rid of odors and make the air feel fresh, my dogs camp out by the minus a2 during the day , they must like it too. I don't wake up stuffy feeling and 2 of my dogs had weepy eyes which is almost gone from both of them. I don't think the filters last as long as stated, especially if you smoke, but I am pleased with both models. I just keep thinking the larger biogs may have been a better choice , with less bells and whistles, for my use,but I'm happy with both models.I did not rate durability since I have had the minus a2 for only a short time, but both machines seem well made.