Yesterday I was at Tulalip and for the first time played IGT's Mega Vault slot. The general play isn't anything to write home about in my opinion, but the bonus offers an initial five free spins with multipliers that stick for subsequent spins. I was playing $1.20 a spin, got the bonus and ended up with $7.60. The girl playing next to me was also betting $1.20 a spin, got the bonus, great multipliers, many retriggers, and ended up with a handpay of $2400. It was exciting for her, as it was her first handpay; and even though it should have been me (don't we all feel that way??), I was happy for her.
I'm thinking if you're willing to slog through to the bonus round, this slot offers potential.