Many people recommend the Pro Version for the excellent real time protection (and doesn't cause conflicts with Avast! at all) and I'm seriously thinking in get the Pro Version too.
The Pro version of MBAM has a one time licence fee and is well worth the price for the additional
Website Blocking that compliments avast! Web Shield.
It has saved me many times from sites that avast! did not know about.
It has
Flash Scan on its updates that can occur several times per day and its
Quick Scan can be sheduled to run once per day.
Waiting a week to run MBAM is
way too slow as malware moves much too fast to depend on only one application to help prevent system infections! :'(
You can get 10% discount for 2 systems and 20% for 3 to 9 systems.