I don't even have a dedicated ereader device, just the kindle app on my phone, and I find that is too small for comfortable reading.
But even if I had a proper Kindle or Ipad, I still wouldn't be a fan. Yeah it's convenient for traveling and things like that, but for me half the enjoyment of books is simply having them. Even if I'm not going to read them again for a long time, or haven't read them yet, just having the books on my shelves is something that I enjoy, and I could never get that sense from an ereader.
Perhaps in time I will switch more to the electronic format, but for now I'm not that pressed for space, or that willing to convert.