Quote from FSU:
I made this play for expiration day only. There has been a strong bias to the upside for the expiration day mark of the VIX. Thats why I played it this way today (long calls long SPY) Ended up taking most of the position off, leaving a few calls for a shot that I essentially have on for free.
I like your way as well, but I tend to keep it on for a short period of time when one index moves more than the other in the short term. This is really a great tradeable play. I tend to use the VIX futures against the SP futures more.
Another great arb to look at is the VIX options vs the VXX options.