@ Derek,

Mafell gets'r done. $$$$$$$

I do not disagree there.
Yet, for any serious timberframer that needs to get the frames cut as quickly yet acurate as possible the money spend would be recovered with just a few frames cut. After that you'll be glad to own one.
I have cut exactly one small frame with 1/2" drill. That was enough fussing around for me. Now there is only one tool, maybe two that I rip out when it comes time to cut mortises. My Mafell and when needed a chisel. 2min. per Mortise after it's layed out and if I need to clean up the bottom of the mortise other wise 30sec. per mortise. That compared to several minutes of drilling and then clean up was worth the $$$$ to me.