 You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
I have slx brakes on my bike and thinking about getting some shimano saints, brakes are ok but not super stopping power, im not a skinny fella and I know it takes a lot to slow 17 stone down, so are the saints any much better
thanks
Yes they are. More, modulated, power.
I find mine inconsistent, good brakes mind but the lever travel is all over the place. The avid x0 trails on my dh bike on the other hand are superb.
EDIT I dont know how they compare price wise, but assuming similar, I would pick the avids every time.
I found the Zee brakes a step up in power and modulation over my previous XT brakes. I'd say it's a worthwhile upgrade.
But I thought my Deores were better than my XT's too. A friend found similar too....his Deore brakes were less trouble than his SLX.
Yes, a big difference. There is also a noticeable difference between Zee and Saint.
In some ways, Saints are almost too powerful: I've just gone from Zee to Saints (and SLX before that) and initially I was slower because I kept on over braking. However, it didn't take long before I adapted to the extra power and now the feel and lightness of touch required is incredible.
Yeah Saints feel like SLX/Deore/XT up to a point and then you squeeze them a bit harder and its like a stick through the spokes
I remember my first test ride around the block after fitting them: I nearly went over the bars on a flat bit of road 
My 18st of lard would miss my Zee's if i didnt have them. On my hardtail i run XT's, and i really notice the lack of deep 'bite' when you really slam on the anchors.
Never ridden saints, but i dont think they could feel that much different, as they are the same housings etc: