Hi Trey, like most other people who have run the long needle carb you commented on the smooth linear powerband. It is definitely a feature of the long LSN.
All the GO motors here in NZ have been sold with the long needle for some years now, and everyone is very happy with the performance and the ease of tuning (once the slightly different tuning process is explained to lesser experianced tuners who may not be able to work it out for themselves). This might be the only glitch you will strike, but it is easily sorted with a tuning guide placed in the box with every motor sold, and backed up with a how-to guide on your web site.
95% of customers pick it up straight away, and then comment how well the motors hold their tune, and how easy they are to adjust if required.
For those that just can't get their head around the tuning, there is the short needle alternative (which is what I offer here).
From our experiance here (on a much smaller scale obviously), I think it would be a positive move for the GO product in the US.