Product review (4 stars): Overall Good
Overall quality is good, not excellent.

PROS:
1.  Low Cost
2.  Holds full keg without issue.
3.  I don't know much about regulators, but the quality seems good.

CONS:
1.  Castors work, but are cheap.  I'm using them for now, but the casters don't feel like they will last long.
2.  Instructions were okay, but I would prefer more detail - for instance you need to make sure to install the rubber washer on the tap tower when mounting it on the fridge.  The rubber washer is on the plastic insert that you can use for converting keg-o-rater to just a fridge.  In order to install the rubber washer with tap tower you will need to lubricate the washer or it will not turn (I used WD40 with minimal effort).

I'm happy overall and my wife even helped me make custom cabinets in the garage designed around the keg-o-rater.