I have used QT for the last month and have found it pretty usefull and decient features (Though I wish it had better research tools)
HOWEVER quotetracker.com has been down for the last 2 days. And unfortunatly the client software requires the site to be up, otherwise you "loose" your registration, meaning even though I've paid the reg price, I am not getting regestered version functionality.
Maybe if they fix this single point of failure in the future I'll re-evaluate and repost a recomendation. However if this doesnt get fixed before monday morning, (friday right now) I'm taking my money elsewhere.
Also their "backup" site
http://www.medved.net/quotetracker is messed up too.. it took me to the US gov's social security site!!! what's up. Get a reliable DNS host, and dont have all your "registration sites" (8 of them!) point to the same freakin place.. what's the point of multiple registration sites if they all fail due to the same issue?