I had one tent that the flap is on the bottom and it annoyed me so much I took it back after one use. It is no fun having to freeze or let all the bugs in the tent just trying to put your boots on when venting the bottom and sticking your feet out works so much better.

I can tolerate the end-entry (I use the side/front entries on my Optic 3.5 and the Big Agnes Slater 3 about evenly) and I can't see where this particular design would work well with a side-entry. IF I only had one choice I'd prefer side.