LOVE my nook tablet.
Had a nook color handed that down to hubby got the tablet.
LOVE it. yep you have to pay for words with friends the app is $2.99
Kind of think it's worth the trade off. Pay $2.99 for the app or pay double the cost of the tablet for an Ipad. The nook app is ad free though which is why it costs. The ad free version for the ipad is the same price.
You can only use the barnes and noble app store because apple doesn't play nice with other companies and the Nook has an android for the operating system. Also you can get a refurbished nook for even cheaper ,
http://www.barnesandnoble.com/u/certified-refurbished-noo...
What I REALLY love about nook is the Barnes and Noble customer service. They are AWESOME. There was an issue with my first nookcolor, took it into the store , I didn't even buy it from barnes and noble but they replaced it , the device was 6 months old. My son then broke the replacement ( cracked the screen) , it was out of warranty and they replaced it for $65 with out the extended warranty, it costs more than that to buy a replacement screen and do it myself.
ETA: the memory on the Ipad is not expandable, you get what's on there, you can add a microSD card to the nook and expand the memory. I have a 32GB in mine.