I own a Jazz I-shift. I think it is great. I did my homework on-line AND with an extended test drive. I knew what I was getting, what it would, and would not do, and am happy with my choice.
WHAT I FIND AMAZING is the number of people in this forum who claim to have bought an I-Shift AND THEN decided they didn't like it!
So, if you are thinking of buying an I-shift, be aware that
It seems to polarise people's views (those who can be @rsed to voice one, that is)
It is NOT like driving a CVT ("Constant Velocity, Variable Noise Transmission")
It is NOT (quite) like driving a conventional auto with a torque converter
It beats the pants of BOTH the above for performance AND economy
It seems to work (well, mine does)
You should take one for a long, mixed test drive. If the Honda dealer is serious about a sale, he will let you. Only don't expect to hog his demo car for a whole Saturday.
Laurence