Other than the obvious 25 watts, what are the differences between the 275 watt ZW and the 250 watt ZW? Are there any other differences? I already have a 275 watt ZW and now have the chance to buy a 250 watt ZW. What is the going rate for a 250 watt ZW? I have the chance to get one for 100 bucks. I thought I remember there being problems with the 250 and it wasn't as good as the 275. Is there anything I should look out for? Thanks in advance.
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