I have a plantronics 520 which is incredible and am in the same boat because I want something new.
The only thing stopping me from the v1 is that google411 is set to speedial#5 and cannot be changed.
Those little quirks have me leaning to the z9i, which probably isn't much different than my 520, so I will be holding off for the q1 like eve6er69
I just won a brand new on off of ebay...so I should be getting it by Thursday....trying something other than plantronics (which I think makes great headsets)
the V1 with the whole speed dial preset thing turned me off of that model.
Have had 2 headsets: jaw 1 which sounded muffeled like cotton in ears and the other one I had stunk so bad I don't even remember the name. I had to yell to be heard. Yet it did sound better than jaw 1
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I have a z9(flashed with z9i firmware v1.1) and a z9i (v.1.1)... while the wife has a v1 (v.5.3... yes it does have firmware updates just like the previous models. ).
Both my z9/flashed and z9i are identical in performance and function.
The v1 seems to have better clarity on incoming and outgoing. I find that both models perform great in windy situations (top down on my roadster doing 75mph. on the 215W.
I have noticed that the noise isolation does seem to be quicker, and a tad better with the z9i (or maybe that's just me).
All in all.... it's hard for me to say which is better. I like them both.
Although like the majority of the posters on this thread, I would really like to give the Q1 a shot (especially since Blue Ant just came out with a new firmware .15, that increases the incoming volume... which is what a couple of people were having issues with).