The launch control is very intriguing for us, we have not had our hands on it, but have seen the calibration files for it, and it seems that it can be manipulated for benefit. The launch control will be reliable because is really is not mechanical in origin, all in software and programming. I would have no concern with it at all.
In the end, im not sure I would justify the 2010 just for launch control, when you can spend 2000 dollars on modifications and run high tens. I would buy a lightly used 09, letting some one else pay for the drive off deprecation.
Once you get the car, I would service the rocker arms, intake, thermostat tune. And make around 485-500 wheel horse power. For example Mr. Stock here is an 07 cars dyno graph we worked on and custom tuned, with the mentioned modifications
http://farm3.static.flickr.com/2445/3987929652_f805a773ed_o.jpg
Browse around this link for more examples, we still have many more cars to add, but you will find a lot of Z's we have done. http://www.flickr.com/photos/ipsmotorsports/sets/
Give me a shout if you have any more questions.