We have a shower tray which fits into the space the bath came out of. It is large enough to put a seat in, should we need one. It has a large fixed glass panel, and the whole thing is very easy to clean. We wanted a tray that was more or less flush with the floor, but due to the configuration of the existing plumbing and joists, we ended up with a four inch step in, which is ok. They advertised the shower tray as being non slip, but it isn’t, so we use two shower mats in there which makes me feel safer. There is a large square thin shower head and an additional hand sprayer which is very useful. We also asked for the controls to be placed where we could turn them on before we get into the shower, so that the water is running warm when you get in, so they are on the wall facing the bit where you step in, not at the end where the shower head is. The only other thing I would say is that we have two overhead showers; the one in the ensuite you can unscrew the head by hand to take it off for cleaning (and they do all need cleaning inside at some point); the new one we found we couldn’t do it without employing a wrench!
The only mistake we made with this bathroom is that I fell in love with a basin tap which has proved to be a bloody nuisance. It looks lovely, but if you turn it on too fast it hits the bottom of the sink and squirts up all over you and the floor! A lesson in not letting your heart rule your head!