I used to run one on my 120. I got it for free, so i used it. I don't think I'd pay for another. it was a 25w Gamma UV unit. It did help clarify the water to some extent (although for my money O3 is a better choice), and somewhat reduced the need to wipe the glass. Getting the flow rate right for any given unit can be a bit tricky, and unless you get one of the units with the mechanism for wiping the quartz sleeve inside the unit, it requires at least monthly dissasembly and cleaning to remain effective.
I guess the question is, what are you wanting to achieve by using one?
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