Bought two of these for our nephews because they were growing out of their old bikes. The aluminum frame appears sturdy and noted a decent component set but would have preferred a full Shimano setup. The rear derailleur was a Microshift and the rear cassette was a mystery brand. Time will tell how these hold up. A few things though. The OEM seat clamp on one bike had stripped threads and because the seats are removed to deter theft, it came apart after a few days of use. I replaced it with a $10 part from MEC, which is definitely more robust. Finally, set up at Sport Check was questionable. The rear cassette on one bike was not properly torqued and came apart and caused the high gears to slip on the first day of use. Good thing I had the proper tool and torque wrench. For safety I pulled the rear wheel on the other bike and the rear cassette, while not loose yet, was not properly torqued either, so I'm sort of disappointed with the 'professional' assembly service on such a critical component. Otherwise, the boys like their bikes, so overall mission accomplished.