Tried quite a few servings as everyone else has.
What we found is that Diamondback was more abrasive on tabs and gloves than most. Not a good clean release.
Halo was our second choice very slick but I agree with Chad was prone to slipping on the string and hard to double serve.
Our first choice is Brownells Crown serving. We tested it in various weather conditions and seemed to give us the best release cold, hot, wet or dry. Locks up very tight, very slick, and durable. Comes in 3 sizes to accomodate different serving diameters.
We are using it till we find something better.
God Bless, Pierre and Jean-Pierre