Love them, that's all I going to say.
I got a pair for my show bridle and ended up asking another pair for my every-day riding as a B-day present. Victory Canter English Tack & Apparel - Horse Tack - Reins - Nunn Finer Sure Grip Rubber Reins(with or without stops)
Don't slip, lay very comfortable in hand, and the leather parts are very good quality, great reins for the price (made in US). I liked them much better than some pricey brands I've seen in Dover and couple other local stores.
My neighbor (after trying mine) got Victory Canter English Tack & Apparel - Horse Tack - Reins - Nunn Finer Rubber Lined Reins
and loves them too.