I bought one of these little jigs to see if pocket screw construction really was as great as the advertisements say- and I'm here to tell you it's even better. I'd used biscuits in the past to build cabinets, but  pocket screws can be set up faster and require no clamping when gluing. The  only downside is that pocket screws, unlike biscuits, aren't totally hidden  from view- but the holes can be hidden in a lot of built in construction or  filled with oak or maple plugs available from Kreg.