I'd give this trimmer 3.5*s
This A3+ trimmer is BIG. The cutting head is a big handful, but it cuts straight and square. The inch and mm guide are very handy for work in our photography business and so far we've had no major problems. However...
The magnetic guide is pretty useless and is a faff to use, so we've left it off. The plastic guard is pretty pointless also. it doesn't keep paper or card steady and is pretty flimsy. We'll stick to holding the paper steady by hand. The biggest problem for us with this trimmer though, is a design issue. If we're trying to trim photographs that aren't to a specific size, then it'd be useful if you can see the cutting edge where the paper will be trimmed. The top rail is positioned directly above the cutting edge and being approximately 20mm wide, this makes it very awkward to cut precisely where you need to.
Other than that, it seems pretty well made and will probably last us a year or two.