The TI as of right now is very stable with a number of platforms. Now would be a good time to buy.....
However, if you are anything like me then you might be wondering whether Access will be announcing a new MKII version around Winter Namm 2008 (January 200

. Access have undoubtedly learned *alot* from the TI and I should imagine the MKII will/would address all the niggles. Things like true USB2 connectivity, maybe a dedicated DSP for the effects section so it doesnt reduce poly, the return of the on/off power button, enhanced User interface. The MKII will be all the things the original TI could have been. For me, thats worth waiting another 6-9 months for.
This is one of the reasons Ive just spent £3k on other studio gear. I cant afford anything for a good 6 months now
DS