Somewhat true. The bottom rail button still allows for some guidance after the top one leaves the rail, as the rocket cannot significantly weathercock with the bottom of the rocket held to a vertical track. It's not as good as having two buttons in the rail, but believe me, having 6 feet of rail and two buttons is MUCH better than having 3-4 feet of rail and 3 buttons, even if the two buttons are 3 feet apart.
As for unistrut? I've noticed you guys really like that stuff out on the east coast, and I'm not entirely sure why. Yes, it's great for huge projects, but some people I talked to at LDRS seemed to be under the impression that anything >10-12 lbs needed a large (1515) rail, and anything L3 sized or so needed unistrut. To be honest, unistrut is completely unnecessary until you get to several hundred pounds, and 1010 rail is fine up to 40lbs or so (believe me - I've flown a 35lb rocket several times off a 16 foot 1010 rail).