As I said somewhere else on DCM, I now have a Samsung 10.1 tablet (your I-Pads will do you till you get a real tablet) and it's great for reading all my downloads from various sites. But I do now use Comixology for recent comics as I have no more space in the house. I understand about not "owning" the comics from them but I have a copy of each purchase on my pc and on my tablet and they are readable off-line, without being signed in to the site. Also, there are some titles which only seem to be available digitally.
I prefer paper comics - the feel, smell and the act of simply turning the page as opposed to swiping the screen. Look at it this way, there is a comic mart in Glasgow next week and there is every chance I will buy some old comics. But new titles, very few of which I read in any format, I'm happy to pay less for and read digitally. Only thing is, you can't sell on a digital copy from a Comixology type site. There is also a French BD site now available, Izneo, which has English language versions of some BD but there is a huge selection of French volumes from lots of the big publishers and, you can rent an issue for 10 days for a couple of Euros, almost like a library loan.
I'm enjoying my tablet and will continue "buying" the odd title that appeals. Makes sense to me.