Oh god, anything's going to be better than a TDS1000B. From the ones I've used, I don't really see any reason for them to exist other than giving people at schools who grew up hearing the name "Tektronix" something cheap to buy for the labs...
I have no idea about the fan noise, I never paid attention to that. My DS1054Z is a bit loud. Never used the TDS1000B in an environment quiet enough to hear it. But the Rigol probes are fine, it boots fast enough, the interface is way more intuitive, it has much more memory, and the signal path performance is about the same.