I believe the Ken Onion version is worth the money. KO version gives the ability to 'dial' an angle where the original requires the purchase of different guides.
ken onion version is much better option. I got mine for $150 ...variable speed is important and variable angle guide (dial) is great.
spend the extra money...and be glad every time you use it.
I make the guys knives at work shave in 30 seconds to 2 minutes, depends on how dull it was to start