It's worth going if you're looking for a Coast dress, not necessarily this season. Not great on accessories or separates. Like any outlet the stick and sizes vary week on week. If it's not hours out of your way I'd drop in. Kildare is definitely the best outlet set up this side of the border..not that that would be hard. THE Outlet in Banbridge is the best on the island IMO.
I've been to the Kildare outlet a few times and I have found a lot of the ladies shops to have a higher than average stock of sizes 8 & 16. You can get lucky though, depending what you are looking for.