I prefer the Milt Sparks Summer Special II for P99 IWB carry.
Truth be told, I'm getting away from "plastic holsters" and going back to leather for carry and range use.
The Kramer IWB #2 is another excellent holster.
I have a Blade Tech IWB that "works" but the quality just isn't there and, it's moulded for a 9mm slide and a .40 slide is a little tight.
For range use I have a Fobus paddle style holster with the Walther logo. Nice, functional holster for the $'s. You need to cover the three rivets that attach the holster to the paddle or you will get marks on your slide.
The new Sidearmor IWB holster is 1/2" longer at the muzzle than it needs to be and this, for me, is a critical point when wearing a concealled holster. It should be 3/8" shorter with the end "folded" over some.
One wants the most comfortable, smallest holsters that one can get for an IWB. The logo is way too small but that doesn't effect the functionality of the holster just poor design. I sent mine back.