I ride two up all the time. Last year was my first time. I was amazed that it pulled the two of us up some very steep inclines. We were climbing a mountain trail (here in NH) and I wondered if it would pull us up, but we had no problems at all.So what do you think of the 900ACE Grand Touring? I am going to buy a new one this week, but cannot decide on engine size. Either the 600 E Tech or the 900 ACE. I am very intrigued by the ACE. Not sure it will have enough power with two people on? I'm sure this will be quite an upgrade from my 1999 Formula Z 500!!