Useful and non useful equipment

Is any= one aware of a web site or blog where investigators or the public can research and po= st comments and/or ratings on countermeasures equipment sold, where they purchased it and ho= w effective it actually is. As we are all aware this is an enormous industry.  We wer= e recently provided with a couple= of items which when tested needed to be within an inch o= f an open transmitter to provide an alert.