mortising

So I was at Lowes tonight, actually looking for a very large socket I needed to work on a guy's truck I'm fixing, but I always have to look in the woodworking sections in hopes that something good is on sale or clearance. Well I found this one for $45+ my 10% off coupon which brought it down to...

Hi: I am presently using a bench mortiser and table saw for making mortise and tenon joints. I would like to build a sled style mortising jig for use on my router table. Has anyone any preferences to creating mortises? Has anyone built a jig (sled) for their router table? Mark