Buyers should prioritize the planing width (typically 250mm to 410mm) and the total table length, as longer tables provide better support for straightening long workpieces. Ensure the machine features a cast iron worktable for vibration dampening and precision. Additionally, check the cutter block type; while traditional straight knives are common, helical or spiral cutter heads are highly recommended for B2B buyers due to their lower noise levels, superior surface finish, and easier blade replacement.