Even though the 2011 BOB Revolution Duallie is not compatible with the Chicco Keyfit30, my wife and I though we would give it a try. Well it does work. The seat fits snug into the adapter and the canopy as long as the seat is completely reclined. Again do this at your own risk, but we feel the seat is snug in the adapter and also the safety strap is there for added stability. BOB will not recommend this as I have had email correspondence with their development team. We run and walk a lot so we were glad to know that it will work. Again the seat does not snap in like the Graco would, but fits very tight in the holder. Overall I feel that it is safe enough for my soon to be born baby and 2 year old.