Danny,
I had two of those Alaknak tents in that size. Everything you said is true (except the weight, depends on what you consider light). And I would always recommend a roof protector. They are completely waterproof when new and stay so if you only use them in the winter. Which is what I did for the first several years I owned the first one. But I went through two of them because I was setting them up the beginning of May for a bear camp and taking them down in October. If you leave them set up all summer the sun eats them and after a summer or so of being in the sun, being inside them in a rain storm is like being under one of them misters they have to cool people off at outdoor functions.

You can get "misted" in a large canvas tent if you don't get outside and loosen up the ropes prior to a storm. That water sucks the canvas fibers tight and if your ropes aren't a bit slack you're going to open small pores.

Never had this issue with any wall tent we owned. But when we bumped up to the17x17 marquee it became noticeable during the first real storm. One of the reason we went with two uprights instead of one. Jim from Spring Valley Lodges shared stories of single pole marquees that ripped the canvas up near the top 'cause the ropes were tight before the storm.