The Sig Romeo 5 is great for a $100-$125 optic. I'm pretty sure they are made by Holosun, so, good reputation for Chinese made stuff and Estonia even bought Holosun for their fancy LMT piston rifles. They are not Aimpoint so I generally don't use them on the weapons I'd grab first if my life depended on it. Functionally the only minor thing I don't care for is that they use "soft" buttons and I prefer the dials so I can quickly adjust to exactly where I want to go. So, I actually prefer the Vortex Sparc just a little bit over the Romeo 5.

Consider the new "Duty" RDS from Aipoint before you buy a T1/2.

Generally, though, I've come to prefer HWS (EOTech) over RDS, but one of my favorite carbines sports a T1.