Let's just say: Sinful Colors Whipped + OPI Designer Series Extravagance + striping tape = pure AWESOMENESS! (IMO, anyways...I'll let you decide for yourselves.)
I used two coats of Sinful Colors Whipped on all fingers but the pinkie which got two coats of OPI DS Extravagance, and after they were thoroughly dry (or so I thought), I used striping tape to create a V & carefully filled in said V with a medium-thick coat of Extravagance and quickly whipped (haha!) the tape off. ;) I just LOVE the contrast of the sultry, sparkly magenta with its beautiful scattered holo glitters on top of the sexy matte black. Oooh! Aaah!
Whipped applied very easily, aaalmost a one-coater, but I really wanted it to be an intense black. Dry time was average, about 15 mins. I thought it would be faster since mattes usually are quicker drying, but oh well. I'm so prone to getting bubbles in my polish, I probably wait longer than necessary between coats now. I'd rather do that than end up with polish acne, I can tell you that right now!!! I hate those darn bubbles with a passion!
OPI DS Extravagance was a birthday gift from my roommate last year, I purchased Sinful Colors Whipped at Wal-Mart for $1.99, and a friend of mine ordered the striping tape from Amazon as part of my Christmas present. I think there are like, at least 10 different colors in that pack and I'm sure it came from China or Hong Kong because she was freaking out about it getting here in time. Good thing we had our Christmas in January! :P