I tried the Comodo firewall, but nothing else from them. It's their primary business and the only thing I would trust them with (although it has inflated just like Zone Alarm did before them). Most of the software protection companies that are good in a certain field eventually lauch a fully fledge security suite, attempting to protect users from other kinds of threats they (most of the time) are not very good against. I suspect Comodo doesn't succeed better than all the others at that game.
My advice would be to try their firewall, but to pass on their anti-spyware/anti-virus offerings since they are almost certainly short on efficiency and big on system ressources.