We rent right now and it is a pretty small place, huge yard though! I have the Bissel pro heat x2 and I really like it. I also have the hand held Bissell for small jobs, stairs and cars and I am really happy with that one too. I bought the Bissell because my mom has had one for ages that still works really well.
When we purchase a home this fall hopefully I won't need it at all because I will rip out every bit of carpet there is!
I would say you are fine with the Bissell if you have a small place. Also I dont use the cleaning solution recomended for use in the steam vacs. I use Mrs. Meyers, they have an oxy powder for pet stains and oders that I mix with hot water in the solution tank, I swear the carpets look better now than when I moved in!