I've used both and ended up preferring the Okki Nokki.
The advantages over the VPI:
1. It's quieter
2. Spins in both directions
3. Platter runs indefinitely without getting hot.
4. Aluminum outer casing
The one thing the Okki Nokki lacks is a proven track record, I've not had any problems with mine (1.5 years use) but time will tell. Also, the price has gone up $100 since I bought mine so it's not quite the bargain it used to be.