I might be biased but I love them, I have three variations of the weights as I use a set for running as well (people run in their spare time?!) for me I like the fact they fill the plate bag properly and also means that the plate carrier doesnt bounce around like I see others do when they start running. It makes you think about anything extra you think you need but don't really and it makes you actually set your plate carrier up properly in the way it sits on your body... nothing worse than a saggy plate carrier.
Another purchase late last night, having it changed up to a 10.5" outer barrel and will be building to replicate a couple of my favorite films (although substituting an aimpoint for the vortex strikefire) I don't know if Marui ever made a fixed upper or even if its possible but I'm fine with a detachable carry handle as it can always morph into something further down the line.