So whats all this talk that the 440 sno pro motors are not a good trail reliable motor? I was reasured that when I bought my '03 it would be a great sled! Now all I read lately is "dump the 440 and get a f5, f6 and so on!" I love my 440 it rips like no other and is as quick if not faster than the pos polaris 600 I just dumped! So what gives?