I’ve put in quite a few Eclisse pocket door kits - they’re more expensive then other options but I think it’s worth it. Lots of the other kits require you to make parts of the pocket with studwork whereas the eclisse ones are a complete metal frame (which you can’t hang anything like a radiator or towel rail on, or put light switches/sockets in). They do require a bit of thinking the first time you do one but the instructions are decent enough. There’s 2 main thing to remember which the instructions don’t really make clear enough which can certainly lead to a lot of mucking about (might explain why someone could hate them after fitting one). Firstly use the very short plasterboard screws it comes with when you fix plasterboard to avoid scratching your new door! Secondly once you’ve put on the timber trim/liner bits on you cannot easily take the door out again or adjust it. So put the vertical jam the door closes into on first then get the door to shut against it right, then check it’s high enough to clear any floor coverings, then put on the small guide for the bottom on before the rest of the trim. I use a few blobs of silicone the timber trim to the metal in case you ever have to get the door out!
Actually thirdly if you don’t want to cut the door down pack the frame up to allow for floor coverings.
If you do all this then it’s pretty straight forward and you won’t have to trim the door at all - there are just 2 brackets that fix to the top of the door which hook onto the rollers in the mechanism.
To be fair to your bathroom guys, lots of carpenters would probably take one look at it and brick themselves and they’re certainly more complicated than fitting a normal door and frame. Also as per the previous comment a normal door and frame is almost always better unless space is a real issue! You can also easily replace a normal door in the future, whereas with the eclisse system you will have to remove and redecorate at least the top and one side of the architrave and the top trim.
Hope that made some sense - it’s not as complicated as i’ve made it sound!
Loo