To put it bluntly, if free and meeting certain criteria I'd very definitely use it. I like the Google Voice model - we specify an address and it arrives as email at that address. If you reply from that address it's like the SMS came from the number it was sent to. Ideally, if that address forwarded to multiple addresses replying would still work, but that would be icing on the cake.
If not free, I wouldn't use it :-(.
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