I have two black 301 short beds, they sew really fast.
I bought a Singer 306 last week, I'm waiting for needles and bobbins. I have lots of pattern cams coming soon, won an ebay auction for 28 of them. It looks to be in good condition. Did I mention that this is a very heavy machine? Oh dear, the heaviest one I own. Glad that I bought locally and didn't have to pay shipping costs. I'll most likely do a motorectomy and treadle it.
Sharon