I just got my tower .75 a few months ago ( when they finally came back in stock ), it's only been on the bench so far but it seems alright, on a sidenote, have a heatgun ready for the first times you start it, this thing was so tight it wouldn't turnover unless it was heated, also when you put the prop on make sure the drive washer doesn't bottom out on the crankcase, mine did and i had to add a small washer between the bearing and drive washer cone, also put some loctite on the carb barrel screw, mine fell out on the second run, luckily i found it.

One other thing i did was remove the backplate and head to check for leftover machining shavings, i did find a small pc inside the cylinder, it's better to find out if it's clean before you start the engine for the first time although if there is anything inside and it does damage there's always warranty.

So far i'm happy with this engine and now that it's getting warmer out i will have to get it on my Super Stick 60 and get flying.