hi there,
we have teams on building sites every day, we use a numatic nvm 200 i think , its the commercial one above the henry,
they get bashed around, and beaten up, dropped down stairs, aqnd thrown in the back of vans, for the money i dont think you can beat them, they eat bits of plaster, brick everything.
so personally i would stick with them.
we are going to change all of them over to 110v in the near future, and then put a generator into each van, to be totally self sufficient on site when needed.
regards
martin