My opinion on Comodo?
We haven't done any thorough tests so all the following is just my 'impression'):
+ solid protection
+ strong user community
+ nice GUI
- the emphasis on leak tests passing is IMHO misleading. Leak tests should NOT be the cornerstone of firewall quality
- moe generally, I don't like the way they market the product.
Overall, I'd say it's still one of the top contenders (although I'd personally prefer other products at the time being [but these are not free of charge]).
Thanks
Vlk