I've owned every 600 class Ski Doo since my 89 Mach 1 583 including, 600 carb, 600 HO, 600 SDI, 600 ETEC and my son currently has a 19 600R. I've always found the 600 Doo's to be an awesome engine and having put 1000's on miles (most likely more than 20-25K miles) and never had a single issue. I sold the 600 ETec to my nephew and it has 15,000 KM's and never been apart. My son's 600r is by far the most impressive, I find it revs quick and pulls to
90+MPH real close to any 800 I've had or ridden with (top end it will run 100+MPH). Its a great engine / sled package, excellent on fuel, clutching is spot on from the factory, sips oil, no vibration at idle or when riding through the bars etc. I can't say enough good things about it, try it and I'll bet almost everyone will be impressed.