I have an RCP2. I have a Nexus 7 tablet as my screen.
First off this is a very DIY/ tech project solution. It is not a main stream solution yet.
I really like it in the car. I have added a shift light and things seem to work ok. If you have cell service at the track (in the car) the telemetry to race-capture.com is fun and works ok as well.
doing the data analysis in real software like GEMS is a little hard to get setup and takes time.
Pros: it is a fun project if your a techie.
it is cheap~ish . I think the base unit is up to 499 with bluetooth, but then you have to add a phone/tablet (i had extra), and mount
You can program/expand it as long as you can do some basic programming.
always getting new updates and features
team seem to be committed to improving the product
Opensource
Cons: You need to be a techie
poor user guides for non techies
lack of Quick easy comprehensive data analysis. (they are working on fixing this) Race-capture.com is ok but not great for comparing multi events/drivers/days
There are always new updates
no camera integration (but you can program that in)
Would I buy it again? I love tech projects, and I love the opensouce nature of the product, so YES.
For a someone that only cares about racing and becoming a better driver. get a Traqmate or more mainstream DA