I’ve got ST4Max, Craig, and it’s not all that shines in there. Of course, the 4 pianos, 4 drum packs and a few more are pretty good, but you can get them in the GB.
As for the newer packs, they’re not in ST4Max as that version was “frozen” when it came out. So you’d better get those now.
Check the ST4Max contents sheet and you’ll see.