I have had a few different electric peppermills over the years, and they are all good.  Just make sure the peppercorns can fit in the little feeder part right before they get ground.  I think it's more about the size of the peppercorns; they were kind of on the big side.  Assuming you're using Cambodian Kampot peppercorns (which everyone should), you should be fine. 
Also, a little tip.  Take your peppercorns and fill the storage part of the peppermill so you know exactly how much you'll need, and then put those in a pan on low heat and toast them until fragrant, about 10 minutes.  Let them cool for a bit and then put them in the pepper grinder. It makes them even better.