I totally get where you're coming from with the round bar beds—they can feel a bit flimsy compared to the solid cast iron. I’ve worked with both types, and while cast iron definitely gives that extra stability, I’ve found that some round bar lathes, if well-built, can still handle a fair amount of work without too much wobble, especially if you're not going for really heavy or large projects. It’s also worth considering that round bar beds tend to be lighter, so they can be easier to move around if you're tight on space. If you’re upgrading from something like the AW240WL and sticking to smaller to mid-size work, a round bar lathe could do the job just fine, but for bigger pieces, you might want to lean toward the cast iron option for that extra stability.