I have not decided to tune my car or leave it stock, but the open flash tablet seems like a nice, cheap way for tuning yourself. I think most of the users here dont tune themself, but buy custom tunes or of the shelf tunes from vendors like COBB, Sam, Softronic, UMW etc.
For us that have a dyno and willing to do it ourself, I think the open flash tablet might be the answer, or the AEM Infinity (but dont think the AEM supports OBD)

 

open flash sounds like good choice, similar to ecuflash(evo world) when it first came out many years ago, i believe in 2008? it was like opening a pandora box in evo.