I had the Startrite SD300 which had the cast iron fence. I had nothing but problems, that were never resolved. I might have been unlucky and aphid a bad machine which happens, however I had to take the retailer through the small claims court to end up with a satisfactory solution. The biggest issue I had was I could not get the infeed and outfeed table to both align with the cutter block and with each other and if this was achieved remain aligned. In my opinion I felt that the lift up mechanism / arrangement for the beds to remain aligned was not sufficiently robust to achieve the tolerances required.
I bought a second hand Sedgwick which does not have lifting tables and is simply brilliant, and in my opinion extremely good VFM.