Woah, hang on guys. Did we just tell him he would be okay with a high end, high performance, fast and touchy 3D monster for a second plane? I happen to own the CZ yak, and take it from me, it's no second airplane for learning to fly ailerons. Yes, it flies nice and smooth on low rates, but it comes in fast for landings (especially without flaps), and doesn't slow down like the t-28 does without high alpha. Not to mention how fast it can be.
I also own the T-28. It was my second plane. It's perhaps one of the best flying models ever built IMO. It's been with me from the start, and even after 2 years, and abuse from teaching me to fly 4ch, it's still going strong. I wouldn't dream of letting her out of my hanger. Although it doesn't provide quite the thrill my faster or more aerobatic planes do, in no way do I get bored flying it. The T-28 will do knife edges, inverted, snaps rolls, rolls, loops, outside loops, hammerheads, and just about any other sport maneuver you want. Once you feel confidant with all those maneuvers, then maybe consider something like the yak.