So here's the deal: The SPS007 is the one I already own. Why am I looking at the Chase-Durer? In a word, legibility of the stopwatch function, which I use a great deal. After wearing the Spring Drive for a couple of years, I'm finding that between my less-than-perfect eyesight and not-very-high contrast of the sub-dial indices, readability, while not impossible for me, is more difficult than I'd like. Compare that with the 1000 UDT XL's higher contrast sub-dials and better still, the center minute totalizer.
Ideally I'd keep both in my stable, but the price of the Chase-Durer is just high enough to make this a bit difficult on my budget. If I have to flip the Spring Drive, would the 1000 UDT XL be a worthy trade?