I got the XL2430 (refurb too) over Christmas and it is amazing. I have been using 144hz/1ms for a while and told everyone that it was the single best upgrade I have ever made. Even with comparable specs between my two monitors, the quality and crispness was obvious immediately, especially when it comes to the competitive aspects of gaming that these are made for. I definitely recommend it.
(There are a lot of things that can be changed on these monitors though, so make sure you take your time understanding what each of the options you are changing actually does. I know a few people that just started changing things and complaining that their eyes hurt after a few hours. I'd also suggest to set up the switch settings at a time you're going to normally be using your computer at so that other variables (day/night, room lighting, or even dead light bulbs) won't cause issues in the long run. It did take a bit of getting used to the switch settings though because there is a really big difference (dark equalizer/brightness/color vibrance for gaming versus warm colors/less blue light for late night standard use). Last thing is not often talked about, but in the end is a personal preference I guess : 24" or 27". $20 more to get the bigger screen is nice, but it's easy to start running out of room on most desks. Also, with where you normally sit gaming, your eyes aren't able to see the corners of the screen very well on a 27" and end up having to actually move your head a bit as opposed to just your eyes. Might not seem like it's THAT big of a deal, but it can definitely start to be a factor.
PS - Their customer support is awesome and very personable if there are any issues/questions...which is really rare and what made me a lifetime customer now.)