I won't get into the whole advocacy debate in detail, but I will note that I have had nothing but sterling support interactions with Servergraph. I got a corporate principal on the phone for several hours when I had some crotchety install comments, and ended up feeling very good about the interaction.
I don't think there's anyone in the TSM aftermarket who's not aware of how important their customer interactions are: it's like PC vendors: for every horror story about Dell, there's a matching one about HP, and one about IBM. - Allen S. Rout