I am sad the Reader Store is closing. It had the cleanest webpages, you could change how many books you could view on a page, a cart to fill up, checkout and download all at once (through the older reader software). No messing with acsm files.
I got lots of good deals through the Reader Store. The only problems I had were some books are much higher priced then other stores and no real search options.
I already purchased a few spare 505's and I am sticking to them until they no longer function. My plan is to relocate the current eBooks in My Reader Library on my computer then redownload a fresh copy from the Reader Store (just to make sure I have them all). Then I will opt-in to have them transferred to Kobo (just hope it is not as bad as the Fictionwise transfer!). Hopefully the one I don't want will not transfer!
I already "I
Cabbages" or "Alfed" my eBooks anyway.