I bought the frontier 42" (RT 1140) tiller when I got my 2210. I wanted a small tiller so I could get in to some smaller landscaping beds that needed preparation, and for a vegetable garden. It's turned out to be good size for my needs.
One note thogh, After the first time using it, I bent the lower three point arms a little. The bending was caused by improper assembly by the dealer and that the PTO shaft was too long. The dealer had mounted the arms so they were extended out too far, So when I hit some rocks it bottomed-out the PTO shaft, and bent the arms. I was able to bend them back in to shape on a press. I cut down the shaft and re-assembled the mounting frame as per the assembly instructions, and now it works better than ever. I just tilled my new vegetable garden with it with no problems whatsoever.