I have an Andis UltraEdge AGC Super 2-Speed. I like it and the ability to change blades. I keep extra blade for the ones I use the most, because a hot blade is often what causes clipper burn. Check the back of the blade against the back of your hand often to monitor the heat. The blades heat up pretty fast, especially at high speed. Low speed is usually fine for most needs. When you change blades, set the flat part of the blade on a cool surface, such as marble or granite to cool it down faster, especially if you'll need to reuse it soon.
Andis Dog Clipper