electric expensive to run, more of a problem if it gets damaged.
wet is fantastic, used loads in all sorts of properties, used it my own house, till I left (that's another story!).
Tried different makes, but now only use David Robbens, unless the client is against it (never happened yet). I have had nothing but fantastic service from them over the years. They are at the top end, but the design is very important and they do all the design work, providing you with all the figures that you need and very good drawings.
Any questions just mail me.