I was able to use the AIM SOLO at Homestead this past weekend, and think it will be very handy for figuring out the best way around the track. I used it for a couple sessions, and gave it to a friend for a session (nearly identical cars), and already we should both be able to pick up at least 1.5 seconds (both fairly noobish but decent driving). It seems a lot of people say this is good for when you've already gotten very fast and are looking for just a little bit more. However, I think it is equally great for the less experienced drivers like me.
One odd thing, the included software cd didn't seem to want to work with my laptop. Not really a big deal though since the software is all available online.
2011 e92 ///m3 zcp - jzb/fr