I used to play like this (right now I'm running a 4-pc) and I'm going to get another, larger kit in the future. I set it up this way because I like having my ride right in front of me over the bass drum instead of to my right side. However, I find the gap between the rack and floor toms to be a bit troublesome when trying to play certain licks. How do you overcome this?
Taken when I was recording recently. Been using this sort of setup for a few years, by far the most comfortable way I've found to mount 2 rack toms.
Here's my Mapex "Orion" in Mappa Burl Wood with Yamaha rack, Pearl stands and Paiste 2002's cymbals.