I am currently using T2/3 fences. I have 3 of them, 2 T2s and a T3. They replaced a Craftsman Align-A-Rip that came with my Craftsman 113.299410. I was having good luck with it. I liked it well enough. I sold it for $175 on eBay and after shipping netted $125. The only reason I replaced it was the very good deal I got on a T-square on Craigslist. I paid $100 for it and it came with a saw. The 2nd one I bought was $100 for the fence and rails. The 3rd one was $50 for just the fence. I like the T-square fences a lot. In my view they are extremely consistent and a very positive locking tool. If these T-squares didn't fall in my lap, I would have continued to use the Align-A-Rip with pleasure.
The 12/24 or 24/24 stands for how much usable cut you will have on either side of the blade. Clearly, the 24/24 can be moved to give you 18/30 or 12/36 by adding some support/extension table and moving the front fence rail. The 24/24 won't really change the front to back distance of your saw but the width footprint, based on the front rail, will be 5 feet plus...61 inches actually.
Consider your footprint carefully when selecting one. Several hundred dollars should net you exactly what you want/need. You asked how long should you get? How big is your shop?
Last edited by subroc; 03-20-2017 at 02:27 PM.