Mr Google tells me that this older one doesn't have all the features of the new version (TM31) - doesn't have the steamer trays (or varoma temp to take it over 100degrees, by the look of the pics), doesn't have the scales, and no reverse function, and the bowl/jug size is a bit smaller.
They must have been well made to still be going strong, and it would possibly still be good if you weren't bothered about those features. Would still chop/blend/cook many things, so it depends whether the newer features are important to you. If most of the appeal is chopping and cooking in one appliance, could still be worthwhile - and obviously a lot cheaper than buying a TM31.
Good luck deciding!!