Hacker Khan
Yurt Dwelling, Yoghurt Knitter
So, I suppose the real question is does the Jetspeed (or the SLDR for that matter) offer me anything I'm not going to get out of an RBZ (1 or 2), an R1 or anything else for that matter.
If you ask TM they will tell you they are jetspeedier, or something like that. I am guessing there will some improvement somewhere when comparing it to an older TM model, but whether that is noticeable shot after shot, and if it is whether it is worth paying the increased cash over an older model, is your call really. Preferably after hitting a few to see if you can notice the difference. As for if you will get more out of it than any competitors current models then that is purely a personal preference. You ask 50 people on this board what the best driver is and you will get 50 different answers, all of then correct.
Also go into buying TM with your eyes open (and to be fair to TM it is the same for most manufacturers) that there will be a newer model along very shortly. So if you are someone who likes the latest stuff then caveat emptor as they say down my local chippy.