I don't pump with Apidra, I am on MDI with Apidra but I pretty much have the same experience as David. It definitely kicks in faster for me and is cleared a bit faster too, but I haven't really had to correct. I can see my bg levels start to creep up a bit but not enough to do anything about it. I did have to decrease my doses to begin with, but I've adapted now and am back to the same doses I was using while on Novolog. I do have to be a bit more careful with it... in the beginning (about 6 weeks ago), I was going hypo in the middle of dinner. I'm still trying to work out better timing with food, but so far I think I like it. All of my averages (7-day, 30-day, 90-day) at my last appt, 6 weeks ago, were in the 150s. Now my 7-day average is 126, my 30-day is 135 and my 90-day is 148, so I can definitely see an improvement and I hope it continues.
Unfortunately, it's still a rather new drug so while Apidra is covered under my insurance, it's not preferred. I believe vials would cost the same as my Novolog pen cartridges, but it would cost a ton more to buy the Apidra pen cartridges. When my free trial vials run out I'm not sure what I will do. Will have to see how much better my control really is and whether I can bother going back to vials and syringes... so many syringes!!
I hope you see good results!