Vista SP1 support, Gamer Mode, Smart Shields, detects and removes CoolWebSearch...
New in v6.x:
Full Windows Vista SP1 support (32-bit and 64-bit), Gamer Mode (prevents any interruptions while playing online games or watching movies), detects and blocks even more forms of spyware at the point of infection, Webroot Automated Research Network (WARN) (provides faster response to new and emerging threats); Release Notes - Last Updated: 11.16.09 (v6.1.0.145)
Upgrade Meter:5
New in v4.x:
Smart Shields for increased blocking protection, enhanced scan engine for sweeps (up to 4-times faster), automated definition downloads for better protection, improved scheduling features for greater flexibility; Release Notes - Last Updated: 12.16.05 (v4.5.8.683)
Upgrade Meter:5
New in v3.5: Improved sweep time (now up to 30% faster), detects and removes CoolWebSearch home page hijacker; Release Notes Upgrade Meter:5
Pros: Smooth, efficient, and thorough in its efforts to flush the baddies; inexpensive (and free evaluation)
Cons: A full sweep can be time-intensive, often taking 10 minutes of more, freeware/donationware alternatives like Spybot Search and Destroy and Ad-Aware SE offer equally effective malware detection/removal capabilities