I guess the biggest factor is do you want a waist level finder?
If so, then can you live with a single lens?
If you answer yes to both of those, then a TLR is the thing to have.
On the other hand the new Rollei is WAY expensive. If I was in a situation to justify that kind of cash on a new camera I'd grab one like a shot, but in the mean time "previously operated" tlr's are a bargain.
One of my main cameras is a Baby Rollei - nostalga? Maybe a bit, but it's an ideal working camera for a lot of stuff that I like to do. Now if they were to release a new baby... I'd have to start saving...