I got an imitation board once for my little niece. They're really only good for learning how to push, foot brake and beginner cruising. I got wobbles going about 10 mph. Plus the wood splintered and warped after a few months.
Imitation boards are low quality boards which are usually genetic or off branded broads. Like if you went on Amazon search "Longboard" without putting a specific brand name longboard, a lot of those are imitation boards. They will usually have a description that says "Fast wheels", "Speed lubricant bearings", "Aluminum Trucks". Basically, they are boards that you'd easily find at ToysRUs, Walmart etc. @SethSmith