i've read not to purchase the version from the china location on
ebay.
Palmerperformance.com, sells you the same software (they make the
software for scantool.net, afaik) but you can use it with any compatible
OBD hardware interface
I have the ScanXL professional and I soon realized I spent more time
configuring the software than actually diagnosing vehicles.
My other software and hardware is Auterra (auterraweb.com). This one is
easy to use, works well but it has not been glitch free (some ford
interface issues, etc.). I have the serial version, which allows me to
use it from a PC and a palm Zire pda.
Both the auterra and the palmer are multiprotocol, handling all the obd
protocols. Between the 2, hands down the Auterra.
Sorry but I cannot comment on the blazt other than it seems to be
limited on the protocols it can handle.
Good luck,
AS