I tried it out for a bit and compared to my current reader of choice this is what I miss:

- keyboard navigation

- expanded view (full content in the list view)

Some other remarks:

- The pricing is a bit high for me, for a couple € more I could run my own virtual server (which could also be used for many other things) with an opensource feed reader.

- Do Not Track is a nice addition but it would be better to proxy the images through your service instead of removing them altogether.

- The feed crawler should handle last modified and etag headers to save bandwidth both for yourself and the content providers (it could also use a proper user agent with a subscriber count in it).