I have a Pulsar 1, running fine in a Sawtooth G4 under 9.2.2 using the 4.0 software that can still be downloaded from Sonic Core.
The software needs a "key file" based on the card's hardware ID to install, but Sonic Core were nice enough to send me one when I e-mailed them. Who knows if that changes in the future, though, so make sure to store them in a safe place. The key files are just text files and should be cross platform, if you're buying second hand the previous owner might already have them.
The card itself is a nice way of getting 16 i/o via two ADAT pairs. It's very solid, but you need the Sonic Core platform app running in the background. This app gives you a little studio, where you can load and patch up various synths, mixers, and effects. I've mostly used it as a digital mixer, to connect all my hardware. It's decent enough, but the effects range in quality maybe from so-so (the reverb) to pretty good (distortions). The patching does make it a doddle to integrate hardware effects or even software running in an ASIO host, though. The synths I can't comment on but there's enough to keep you busy for a while, including a full digital modular.