We have a walkthru, I have found that the tent is the least impressive part of the camper. You can tell its not an Aussie tent.
In saying that, I haven't really had any issues with the camper or the tent, there were a few bent poles when I had the tent setup in the backyard doing mods ( so no guy ropes) and we had a massive downpour, I did feel better about the poles when I found out that the SES had call outs all over the place and lots of roof damage was experienced... Hey if a proper roof couldn't hold upto the storm I can't expect much from poles right!
We are a family of 5 and the extra tent room is worth it, from memory the walkthru is a 12ft tent and the other is 10ft.
There is a water pooling problem on the ends of the annex roof, but we fixed that by adding an extra support pole.
Given the choice again I would still choose the walkthru.
If you have any questions, just ask.
We have done heaps of mods to ours and we are pretty pleased with it!