i disagree,rusty oil cans give you more spin and control.
I've had the Oil Can or trusty rusty Vokey for a couple of years and to be honest unless you let it get into a real state I don't think it works. The trouble is after each shot you clean the mud off the face, which in turn dries it therefor you don't get a lot of rust. I leave my clubs in the car as well and it still doesn't get that rusty. It might be ok for the first couple of shots in a round of golf but after you have hit a couple of balls the rust grip has gone.
If I was to buy again it would be the spin milled version, I think this is in the satin crome. I have practiced with these and IMO they create more spin than the Oil Can.
This is spin milled, AND oil can finish.
I hope I'm allowed to link the online shop- for £67 including free delivery I thought it was a good source to share with the forum...
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http://www.thegolfshoponline.co.uk/index.cfm?fuseaction=main.dspSingleProduct&productId=1108
Well there ya go.........didn't know you could get a combination of the two.