iirc, dasetek were very popular with the citroen / puegeot scene as the standard ecu's on those can't be remapped
the unit is cheap at £300 for a reprogrammable ecu, but then you have to get it wired into the ecu loom and mapped at approx £500!
thats for mapping & rolling road time.
alot of people got rid of them though, i think because it can't be used with turbo's.
i may be wrong!
if you want to go down the route of standalone ecu's there a far better units available than dasetek!