I like the EOThingy okay. I have one and do really like it a lot. However, I'm still probably more of an Aimpoint fan.
I have an Aimpoint in a LaRue Tactical mount and one still riding in an ARMS 22M68 with the canteliver spacer. The LaRue is a so much better mount, IMHO. Now, if you go the Aimpoint route and you've got your heart set on the ARMS rig, well, I'll sell you mine and pickup another LaRue.
If you want a flip-up BUIS, go with the Troy. It is built like a tank, easy to deploy and the adjustment knob won't accidentally get knocked around, changing your POI. Very high quality.
For a fixed BUIS you won't beat the LaRue. No elevation adjustment (which isn't needed on a BUIS, IMHO) to add weight and/or get accidentally get changed. It is a true quick release - no knobs to torque. The lever is on the right side to avoid interference with the charging handle.
If you go the EOTech route, get a AA battery model. MUCH better battery life than the N battery models, plus you can use lithium batteries.
Best of luck to ya. Believe me, you will NOT regret the decision to dump the TCH.