Skype with PBX systems.

Hello. We are a medium sized solutions provider and have recently had great success trying out a relatively new software call Skip2PBX which empowers any PBX system to make calls with Skype.
Although we have seen it mentioned that past experiments with Skype left a little to be desired regarding discriminating business application, I have to admit that this product in particular has surpassed the others that we had tried and we are now looking to engage our clients into reconsidering what an implementation of this kind, (Skype with a Linux based gateway) can in fact do.

Has anyone else out there noted the difference between Skip2PBX and some of these other "Skype to PBX" gateways?