I've still had it on my laptop to see how it does, but so far so good, no fuss, no problems, I feel it's very light and no slow down.
I think it's a very good deal to get Kaspersky technlogy for free, even it's a stripped-down version but it's very worth to get the full auto update almost hourly and full protection from viruses, worms, trojans, adware, spyware, riskware, rootkits from its real-time file/mail scanner.