any opions for this programmer?

[Hellz]

03-05 Hummer H2 Street & Performance Proflash Programmer

Street and Performance Electronics PROFLASH hand held programmer is the most versatile computer tuning tool on the market today. Developed to permit tuning for your specific needs, the PROFLASH offers a variety of tuning and best of all, its easy to use. When PROFLASH is plugged into your vehicles OBDII port under the dash, it communicates to your vehicle?s computer. With a simple series of yes or no questions allows you to tune your engine for more performance, speed limiter, better shifting control, pre-detonation control, gear ratio and tire height changes. The kit comes with simple instructions and everything you need to get your engine tuned. And in as little as 20 minutes, the PROFLASH programmer will unlock the unexploited power in your engine. No other hand held programmer on the market offers the reliability and versatility of the PROFLASH programmer. Currently the PROFLASH does not have the capabilities to read


i ask because i have a chance to pick this up for $50.
all i need it for is to change my speedo for going to 37 inch tires, which says it can do. but.. if it can do everything it says, sounds like im getting a nice deal. anyways, just looking for others inputs