Yup, I also like it because it is the fastest AV out there and has nice detection.
Well, I think I've been using ESET Smart Security for about four months without any added anti-spyware or firewall and my PC is (still) working like new! No troubles at all!
If I had to choose another AV, I'd go for Kaspersky.
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PC/Laptop:Compaq Presario v5000 Notebook
CPU: Mobile AMD Sempron 3000+ at 1.8 GHz with PowerNow! technology.
Graphics: ATI Radeon Xpress Mobility 200 Series.
RAM: 512 MB.
HDD: 60 GB.
OS: Windows XP Home Edition SP2.