Well even with the skyhawk, it is still a piece of junk that will not last very long
Being 15, I cannot afford the nicer engines, and after some bad experiences with evil vendors, I came across dax
His engine has given me nothing but pleasure for its life so far and i highly recommend it, but it's still a happytime
So just like mastafoo says, cheap kit from dax=great experience but iffy on the reliability aspect (requires lots of tinkering)
really nice 4 stroke from any number of vendors=ultra reliable with set and forget parts that will carry you until you're an old man