I have a kindle DX with firmware 3.2.1 with launchpad installed. This way i can go to duokan and return back to original firmware without a restart. Going to duokan takes about 10 seconds and returning back about 45 seconds.
I generally use the original firmware for my daily readings (amazon bought stuff or some mobis i sideloaded.)
For PDFs i generally prefer duokan for the reasons explained by me and eLINK.
I rarely read epubs with duokan because i find converting them to mobi by calibre and reading them with original firmware much easier. Duokan's fonts have still a long way to go to race with Amazon firmware.
Also installing 3.x firmware to a kindle DX has a great advantage that hasn't been mentioned here. firmware 2.5.8 doesn't support some non-Latin characters (In my case it is Turkish characters) so i can't view my sideloaded mobi files in Turkish properly. Firmware 3.2.1 solved this problem as well.
So i would strongly suggest installing firmware 3.x to your kindle DX and then install Duokan. There is instructions on development forum for both.
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