I have a Trijicon Reflex II that I have used on my Encore (.357 and .44 Rem Mag). I've had it on a Desrt Eagle, a Marlin lever gun and a few others. No complaints over the past 5 or 7 years that I've had it.
It is a good sight overall, but there is no way to controll the brightness of the triangle, other than putting a little tape on the collector to dim it a little. The only time it seems too dark is indoors when there is a lot of contrast.
It's extremly rugged, and not too bulky IMO for the Encore. Adjustments are very predictable and repeatable, one thing you won't get with a Doctor or J Point sight.
The only real alternative IMO is an good Aimpoint.