I like the Reeder. I have a TW-90, a Bader B-III, a Wilton, and a couple home brew grinders. The Reeder is champ by far, IMHO.
Greg Reeder makes a very solid machine. Their accessories are also very well built. All aluminum is also important if you grind post-HT with a Kool-mist type system.
The tracking is really nice with coarse and fine tuning (roll and yaw). All their contact and drive wheels are machined to super tight tolerances and balance.
Not everyone needs one, but their surface grinder attachment is really good.
The belt tension is simple and easy. Some folks like a ratchet system, but I have never had a single issue with the spring setup Greg uses. I have had problems with my TW-90 ratchet not locking easily without regular cleaning and grease.
The only thing some folks don't like is the vertical/horizontal tilting setup. It is a brace bar that you lift and tilt the grinder ... super simple and not complex ... but not like some fancy hinged setups. They sell a really heavy-duty tilt and flip retrofit that does that if you need it. That add-on is a bit pricey for anyone who doesn't need to flip their grinder back and forth many times in a knife build (which I can't see why you would). I never had an issue with the simple brace bar setup.
They make a great all aluminum mobile base for the grinder that is rock solid, and you can roll your grinder where you need it and then put it away. This is a very useful accessory and very reasonably priced. I would say it is a must-have for most folks.
Greg's grinders and accessories comes packed on plywood boards and screwed down solid. It looks like how you would ship the Mona Lisa.
If you like building your own special work rests, they sell the work rest mount and pig's knuckles at a very low price. With them you can build a super articulated work rest arm.
I haven't ordered their rotary platen, but my guess is it is better than the one I have from Beaumont. Probably on my next order.
Final comment on the Reeder - The machining is beautiful. The two machined aluminum tracking wheels are artwork to a shop person.
The Ameribrade* is more expensive - It's foundation grinder package with a VS 2HP and 2"/6" combo-arm wheels is around $2800.
The basic Reeder chassis with the wheel kit, plus a 10" independent contact wheel, and a 2HP VS motor kit from my favorite motor supplier is right at $2000. You can add a lot of accessories like the glass platen kit, and the mobile base and still pay less than the Ameribrade.
*I have never used or seen in person an Ameribrade, so my comments are based on their ads and images.