I was told recently by a friend in Germany that one of their magazines (Segeln) ran a similar test on Radar Reflectors and the best was a "Rasmus 1" made by Rasmus-Marine. Supposedly it out performed the See-Me.
Unfortunately all the web-sites I can find are in German.
Adaero
Thanks for this reply and for all the others on here. Some did overlook the original question.
On balance I have no reflector now, so I need to invest some money, but would prefer that to be in the AIS and a small reflector rather than a top notch reflector and no AIS.
There must be some good small reflectors and if there are then that must be better then no reflector.
Anyway thanks for all the comments I have a lot of advice to consider.