Somehow something got deleted from that last message.
The British did tests on radar reflectors and found out that the traditional ones were every bit as effective and sometimes more effective than the high priced, so called "High Tech' ones.
There was a recent comprehensive test in Yachting Monthly or Practical Boat Owner which was a bit of a surprise. They tested the image both vertically and at heel. The Blipper was of very limited reflective value, with the Echomax coming out slightly better. The Tri-lens was significantly better, particularly across the range of situations, enough to make me get one to replace my Blipper.