As usual for Amazon shops, excellent delivery time and well packaged. The unit performs really well, even on the lower power settings (we rarely use it on full) especially as we only have 1.1 bar available.
Being reasonable at DIY, I found the instructions to be good, with the templates accurate, and was not daunted by the potential difficulties someone with less experience might face.
The only issue is as follows: if you are replacing an older power shower (like I was) I had a couple of problems as I was going to use the rear entry panel. Therefore, I had to cut the metal pipework, and fit flexible hoses with plastic push fit at the shower end.
As this shower uses plastic push fit, you will have to cut a larger hole to accommodate the larger plastic fittings ... therefore I had to increase the hole size from 7cm to 10cm.
Apart from that having to go to Screwfix for a larger hole cutter and then cutting the hole - I fitted the whole thing in under an hour!!