Well, suit yourself..... the one's that just weld on the ends probably do help a little,,,,but a bit more cutting, fitting, and welding will improve the rigidity a whole bunch more..... I guess I never have been willing to settle for a little bit better when a whole lot better is just a bit more work. The frame ties don't have to protrude all the way up and kill your seat room... If they are only 1/4" to 1/2" above the floor, just enough to get a good weld, that's plenty.

As for Alston's, I've used some of their stuff but for something as simple as subframe connectors I just fab my own usually for less then what the freight charges alone would be to ship a set.... That way you can tailor the fit to your floor pan and torque box, and not put up with what some manufacturer thought would be the ultimate setup. It's the little things that separate the winners from the also-rans.....