I thought about doing this as well, but IMO it's not worth the price most people are selling it for. More than likely it's going to be used and the prices I saw were between $450-$600 which was more than I was willing to spend on a used monitor.
For than money you could get a really good 24" IPS monitor (i.e. Dell U2410 or U2412) or spend a little more for the 27" TBD (I had one in my Amazon gold box the other day for $880).
If can find a good deal on the 24" ACD, then go for it, but for me I was not willing to spend more than $300 for a used monitor.