Just wondering if anybody here has ever used Gauge reducers and if they had any feedback on em. good or bad?

I've used 10-12 Gauge-mates in my 10 gauge 1878 Colt with very good results, they basically turn it into an over-bored 12 gauge.
Steve

I have a 12 to 20 set of Gauge Mates and really am happy with them. They pattern well and kill trash birds to long distances.

Lenard