Good quality item, easy to install, does the job of filtering well, good aid for injecting inhibitors easily/quickly and good drain down point also stops our boiler engineer from the gas company accusing the radiator system to be at fault for the boiler problems! and wanting to sell us power flushes and filters etc (no chance pal)- 'we only have comprehensive boiler cover'.
The fernox D40 system cleaner we used has bleached the black plastic of the filter but this is only cosmetic and the filter is in a cupboard so if your fussy or have a fussy customer beware.
Recommend this type of filter as there aren't any filter cartridges to buy or get blocked, this type you just drain rubbish out of the bottom tap after turning shut off valves off which are supplied with filter and pulling the external magnet out which drops the metallic rubbish it's caught out as well, brilliant idea.
There are brass filters on the market to consider from other manufacturers but they were 50% more expensive at the time so if monies not an issue go for one of them just check the versatility i.e. positioning (horizontal, vertical etc) the fernox one is very versatile.