Opted for one of these in the end. Rep came round with it this morning, i drove around 20 M12 x 120 coach screws into an old hardwood sleeper. No problems.
if you get the backup service I have had from Hilti over the last few years, we had a few dozen various tools, some buy outright some on lease, their repair infrastructure is second to none, drop it in the depot Monday off to Glasgow or the depot down south for repair returned by courier Wednesday, every time no exceptions, even dropped stuff in 16.40 Hrs Mon still back in two days, repair replace, no quibble no fuss, costs a bit more, guarantee and after sales service second to none, sadly getting spares to fix it ya self is a major problem, + all sorts of security features have been developed, If you ever buy a dodgy bit of gear think very hard about taking it in for repair, Seriel numbers are even inside the case. and if its been recorded in the Hilti system expect your collar to be getting felt. Every stolen piece, we informed Hilti of the model and seriel number.lasers drills drivers etc etc
good buy you wont regret it.
Stan
and they do amazing trade in deals when you bend their arm.