It looks like the very early signs point in the direction of profitability for now.
I too will try this method for my VP. The only catch is that I live in Europe. So here's my shot at building a decent 3x33% 2XPP VP.
Let's first think about the ETF funds.
Stocks:
1. ETFS DAX Daily 2x Long UCITS ETF (EUR) | DEL2
2. db x-trackers Euro Stoxx 50® Leveraged Daily UCITS ETF 1C (EUR) | DBPF
3. db x-trackers S&P 500 2x Leveraged Daily UCITS ETF 1C (EUR) | DXSL2
4. ProShares Ultra S&P500 (USD) | SSO

--> I choose DXSL2. It's in EUR and has a larger basket than the DAX which has only 30 companies. Didn't find any leveraged funds for the MDAX.
Bonds:
I didn't find any 2X bond funds in EUR. The only one that might work due to it's average maturity is: GILTS Double Long Daily. Good for 50% of the PP. But then we are back at a 4x25% PP.
1. db x-trackers II UK GILTS Double Long Daily UCITS ETF 1C (GBP) | XULL

2. db x-trackers II US Treasuries Double Long Daily UCITS ETF 1C (USD) | XUTL

3. ProShares Ultra 20+ Year Treasury (USD) | UBT
(No graph.)

--> Only suitable option is Ultra 20+ Year Treasury here. It's in US dollars but as far as I know there are no other options available.
Gold:
1. Commerzbank ETC 2x Gold Daily Long (EUR) | X002
2. ProShares Ultra Gold (USD) | UGL

--> Do you any problems with using an ETC? Neither fund does hold gold directly or physically. The ETC is in EUR and follows UGL quite exactly.
Conclusion
For now I pick.
Stocks: db x-trackers S&P 500 2x Leveraged Daily UCITS ETF 1C (EUR) | DXSL2
Bonds: ProShares Ultra 20+ Year Treasury (USD) | UBT
Gold: Commerzbank ETC 2x Gold Daily Long (EUR) | X002
I do have living expenses for an entire year set aside plus an emergency fund.
I will rebalance the portfolio, every 12 months with 30% rebalancing bands*, if and only if, a rebalancing band would be triggered.
*I will rebalance if any one of the three asset classes exceeds 43% (1.3*33%) or falls below 23% (0.7*33%) of the total portfolio
There you have it. Let me know what you think!
Thanks!!
- ILM