I purchased the 7.5 and they offered the upgraded to 8 for free. It is the Internet Security 8 version. I like it and have had no problems. I have 2 computers so I purchased the 3-license one—can’t remember cost maybe $80.
Spybot when running seems to be my heaviest user at 50% CPU while scanning. After it stops scanning I'm back in sigle digits with all normal background programs going.