I have T5's in 3-15 and 5-25. Had them both since the very beginning. Honestly, I like them a lot. I have a Schmidt and an ATACR also, and I guess the glass isn't as good as the top tier stuff, but it's darn good enough for my purposes. The 5-25 lives on my primary .22 trainer, a 40X. I shoot that rifle a lot. Probably more than any other rifle I own. I never feel like I'm wanting for anything when I shoot it. The 3-15 lives on my back-up competition AR, and in that role it gets little use. I did shoot it the other day, and I recall being impressed with the scope again.
I have the budget to buy more expensive glass than the Steiners, and sometimes I do. I do it because I can and I'm a scope junkie. If a Steiner was at the top of my price range, I'd give it serious consideration. In fact, I was just toying with upgrading an XTR II that lives on an AR, and another T5 is on my short list of glass I'm considering.