I haven't got the whole system, I've got the profiler and resin canister.
The setup is great, all John guest push fits, so no leaks, and quick to put together. The ro's are the same as the 4040 ro, but half the size, so having 2 of the ro's will work like a 4040.
The prefilters are great because it only needs 1 as it is a carbon and sediment in one, they can last up to a year, if not longer, and they replacement per filter is only £22.