I have an Ares BTR gen 2, 4.5-27 mrad
Glass quality is ok, nothing special, past 20X the image gets a bit dark, tracking is fantastic, holds great zero etc. I like the reticle, turret feel is good. I shoot long range set at 20x.
I would like to have compared it to an ETR to maybe get better glass.
The Ares ETR is definitely an improvement on the Ares BTR, i've had the Ares BTR, Midas TAC 5-25 and Ares ETR, sold the BTR for another ETR
I have an ares ETR and BTR Gen 2. Both have been sent in for warranty within first year of owning them. I think the glass on the BTR sucks, so I sold it and kept the ETR which I absolutely love. I would skip the rest and go straight to the ETR.