(and I don't cuss often)
I am typing on my new-ish E1705 with that display, and I gotta say, it is BEAUTIFUL. The most obvious difference between it and the standard WXGA screen is the resolution - WXGA will be 1440x900 while this screen is 1920x1200 (huge!). In layman's terms, you will have more real estate because everything on the screen is smaller (but completely sharp!!), increasing the amount of things you can have on the screen at one time.
Yes, it is glossy. I don't find it to be a huge problem, though. On high brightness, the screen is clear even with a light behind you - the intensity (noticeability?) of the reflections depend on the brightness. I normally use highest brightness on AC power, and 3rd from highest brightness on battery, which still suppresses the reflections enough. I don't really think it's that much of a deal, and I was definitely willing to sacrifice a matte screen for the huge resolution.
Unless you have vision problems, go with the ultrasharp uxga. The 1440x900 will be easier to read because everything on the screen will be bigger, but I assure you everything is quite easy to read on the 1920x1200. Don't expect to stand across the room and be able to read things, but certainly sitting in front of it as people do with laptops, you can read everything on the screen very clearly. It lives up to its promise of UltraSharp.
The only worry that you might have is the "gambling process". As you may or may not know, Dell gets supplies, including screens, from multiple manufacturers, each with their own quality level. Some manufacturers, such as LG, are famous for their great screens, but others such as Sony (i think?) are infamous for their backlight bleeding, dark corners, uneven lighting, and dead pixels or even dead rows. It is all a matter of luck (well, timing. but since we don't know the schedule, it is luck) as to which manufacturer's screen you get, but you are able to send in the screen for all of the situations except dead pixels, unless you get many of them. I believe the policy is 5 or less dead pixels does not qualify for an exchange. Of course, Dell's customer service is also known for being gullible and giving in to the customer's requests, so I'm sure you could probably convince them to exchange your screen in any case, especially depending on which warranty you get.