On the face of it this appears a good deal, however, as a landlord who fits a number of taps/showers etc I fail to see the advantage of the wall mounted fitting? I have either fitted such a unit directly to the bath or installed a stand alone shower supply unit such as a Mira directly from the mains. My preference is directly onto the bath as this involves no additional tiling or splashboard work.
Crap if your water pressure is low
yes, need good pressure for these
Very cheap for a thermostatic
If pressures are equal this will work fine