I switched from a Nook HD+ to a Samsung Galaxy Tab 3 8" tablet last year. I loved my HD+, but became disillusioned with the weight, the slow processing power, the differing app versions (the Nook's 'native' Twitter vs the Play Store's Twitter, for example). I primarily used my HD+ as an ereader and social media feed browser/media player.
I decided to downsize to a refurbished tablet from Samsung (
http://shop.us.samsung.com/store/sam...emeID.38225500). I've been very pleased with it so far - the only downside is that for my model, the resolution isn't as high as the HD+ - however this has really only been noticeable when watching movies. For reading and casual web use, I've not missed the resolution. The 8" size is perfect, and its so light and portable now compared to the HD+. I was so impressed with how speedily everything loaded on it! On the HD+ it was such a chore to load even a webpage - it's night and day difference now.
The tablet is very similar in design and style to the Nook Tablet that's been released in partnership with Samsung - the primary difference being the extra inch and that its not locked down at all. I don't get the Nook "interface" or screen widgets, but I don't miss them either. You can do the same thing by installing the Nook app. One thing to be note about the Samsung tablets though is that the bezels are very thin - there isn't a lot of "gripping" room when holding the tablet. As I read my ebooks in landscape mode, this isn't a big deal for me, and having a good case you can hold on to will help as well.
As an ereader its very functional, I have downloaded the Kindle, Kobo and Nook apps and all run fine reading their native files. However after much trial and error I've discovered that Moon Reader Pro is the best ereader app out there if you have a large library of sideloaded ebook files and want them to show up quickly and easily on a library screen or on library shelves. The Nook and Kindle apps have their own issues with combining sideloaded books along with books purchased from Amazon, for example. So now that I've found MoonReader I can't go back to one of the other programs, it's that good.
Good luck on your decision!