And I find them over weight, under powered junk. I can get them to run well but there are just too many better choices out there today even in the cheaper brands. The Thunder Tiger PRO series, K&B and as of last year my all time favorite is the SK line sold through Super Kraft. The SK line I like as much or maybe better then even the OS?? Still, for the money if you want a trouble free engine that will be with you for years you really can't go wrong with an OS. The new AX line is outstanding. I would go with the .55 instead of the .46 though, it can be used on a lot more planes both now and in the future. I just put one in a 60 size pulse and it's a great combo. I had the same engine in a 40 trainer and it worked out quite well. See what Clay was saying, put two modelers in the same room and the debate will never end. It's your money and you are going to have to decide. Don't take what you get off the net as fact either, gaRC has only seen these engines, never owned one but it sounded good, made me want to go right out and buy one. Well, almost!!