Most security sites I read and monitor all mention SWAT IT by name as a good product, with a link to www.lockdowncorp.com.
Their website talks about their trojan scanning tecjnique.
It has never placed a COOKIE on my PC. On INSTALL or DOWNLOADING definitions updates, I have never gotten ANY REQUEST of any kind to buy ANYTHING. As for them TRYING to sell you another COSTLY product, nothing wrong with that, as they just provided you with a FREE, I think very useful product. Just don't BUY their other product. Pretty Easy!
Their is a database used, as the updates are timely and regular.
The scan time is about 1 hour, as it's though and if you see the scanning, it is verify EVERY file, which does take some time and can't be done in 10 minutes.