The only problem i'm seeing so far is the post shower shake down but not sure a shower curtain will be much use to stop it. It will be better once the utility room is fitted out with some worktops around the washer and dryer and covers a chunk of the wall. I suspect we'll not be as fussed once its less new as well.
I actually managed to towel him down pretty well before he shook but he's a pain to get properly dry with just a towel so we may have to invest in a dryer nearby to finish him off as much as he hates them!!
In terms of the actual shower, tiled area, drain hole etc it all works very well and you definitely need it set up in a way the shower head can be held whilst the water runs so you have both hands free to do the shampoo or alike. Ours is nothing special just a normal shower unit fitted lower down. If you google "Dog Shower" you see some very fangled set ups but not sure they are needed.