I've commented on this previously but for those who came in late, I've been using a Samsung Galaxy 10.1 inch, and with the free Perfect Viewer app I get great results. Interesting that Poztron feels that downloading is cumbersome and I have to admit that rather than download direct to the tablet, I much prefer to download files to my pc and transfer to the tablet or a micro sd card. Might seem like an unnecessary extra stage but, believe me, it's easier and the difference in reading from a downloaded .cbz, for instance compared to Preview mode is big.
Perfect Viewer also has an addon for pdf files which is smooth and easy to use with no top tool frame on the page.
Also, using a micro sd card - not available to ipad users - lets you load it up with literally piles of comics and mags so you always have something to read to suit whatever mood you're in.
Yoc, I look forward to trying the 'Challenger Comics Viewer'.
Buying digital comics can be an option also and Comixology has an excellent selection. Their app works quite well, (for me at any rate) and some of their titles are now available without DRM, so they can be transferred to your tablet's memory. In the case of Izneo, there is a great choice of French, and English translations of, graphic novels (BD) which can be bought outright or hired for 10 days. It's well worth looking at their offerings.
Sorry, I know very little about Apple products and have never actually used them.