I've been using the YJM pickguard for six months now and am generally happy with it. It was fairly expensive, but was very very easy to fit (I hadn't been near to a soldering iron in years and it was very straightforward) and the quality of the wiring and build is outstanding. My one problem is that the tone of the neck pickup isn't to my personal liking, as if you roll the tone off the neck pickup so as to get a very fat sound, as I like to do, the volume is affected to such an extent, that it ruins the sound. I've used lots of Stratocasters over the years and not once had such a pronounced loss of volume with the tone rolled off as I have with the this neck Seymour Duncan. The other two pickups are fine. The tone and volume knobs are very smooth, which I like ... the volume knob is the best that I've ever used for sounds swells/violin notes.
Overall a good thing ... I still buy it, even allowing for the neck pickup problem.