I have a Super Tigre G-61 ringed on my King Kobra that is as reliable as any O.S. Max engine I've owned. I also have an old Super Tigre Bull Ring .46 that is dead solid reliable.

You can have problems with most any brand of engine until you become familiar with how a particular engine responds to various glow plugs, fuel types, propellers, weather conditions, tank setups, and tuning specifics. Too many pilots learn to tune on O.S. Max engines and then decide that any brand that doesn't behave exactly like their O.S. Max engine did to all of these variables must be defective.

I don't have any doubt that Super Tigre has produced it's share of turd engines over the past few decades, but you can't keep bashing a brand because your 25-year old ST .45 needs some carburetor help.