Makita, Dewalt & Milwaukee Router Adapters for Festool Guide Rails

That is a pretty slick looking solution. The only issue that I see with style of guide is that the only way to make a dado/groove wider is to move the rail itself rather than move the router in relation to the rail. This can introduce the potential for errors. Nudging the rail over a tiny amount is hard enough in the first place, but it could also introduce an unwanted taper in the dado/groove.
If all you need is a cut the actual width of the bit, it’s probably is quicker to set up, especially if you had a spare base to leave it on all of the time.

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