Accurate Comps on Redfin

[Nghi Le]

I've been hearing a lot about Redfin as the best free way to get pretty good comps.  I'm wondering how you guys do your comps on Redfin?  It asks me to pick and choose properties to compare with, but it doesn't allow me to set certain limits (such as sqft within 20%, within 0.5 miles, etc).  Do you guys just pick the top 3-5 properties according to "Redfin's special blend", or do you do things a little bit differently?

I currently have a software called PropStream (that I paid for through a guru seminar) which allows me to define certain limits, but I'm just not sure how accurate its listings are (and if it's missing any).