I had a chance to use the standard wood blade made by Imperial on Tuesday. For the money It worked as well at the Fein brand, with one exception it was designed for the other brands of osculating tools as well. So you can only position the blades in N, S, W, and East directions hope that makes sense. The may make one for just Fein brand but I have not seen it.
I purchased the varity 10 pack a couple of months ago. I really liked the selection in the pack. On average I use to consume 1 or 2 Fein blades a week. I am just now needing to resupply that ten pack! The variety pack is well worth it. Ten blades for under $100. I would definitely give them a try.
I picked up a few packs of these blades from sean Ackerman at tool nut the other day. So far I am impressed with the quality of the blades, especially at the price.