Everyone offers very similar tunes and options to the tune. Some offer free updates, user map switching, etc, but all very similar between $800-$1000 at any given time. On the dynos you will see about a 8-12 hp increase on a stock car. The 30 hp increases are mainly a result of going catless. The features of the tune make that more tolerable (cold start delete, SES suppression). Don't get wrapped around the axle on how much hp am I making or will I be in the 400hp club. Each car, conditions, and dyno are different and factor into the resultant hp. When making your decision do some research on how active the sponsor is in the forum, how quickly and tactfully they respond to posts, and do your own assessment on customer service.
'13 35i M-Sport X3 | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me | Recaro Child Seats
'15 M3 DCT AW/SO | RKP Diffuser | P3 | M Perf Spoiler | iND Exterior Trim | Recaro Child Seat