"has anyone seen the Vaude Hogan Ultralight?
Has anyone had any experience with this tent? it does seem very lightweight....but does it seriously sacrifice strength for weight?"
I have this tent, and I've been quite happy with it - quick to set up, sufficiently roomy for two, waterproof, and warm (no mesh for the inner). Be aware that there are two versions that are easily confused with one another - a slightly bigger and heavier one sometimes called the Ultralight 2, with a height of 105cm and an advertised weight of 1700g, and the Ultralight 1 at 95cm and 1500g. I have the bigger one. I think the smaller would be too small for two (that's probably why it's called the '1').
One disappointment for me with the tent was that the weight was seriously understated. Instead of 1700g, the trail weight is 1950g, so it's not as light as I'd hoped. I imagine the same is true of the '1', so be warned.
The other issue relates to its performance in strong winds. It has a pole design like the MSR Hubba Hubba but without a crosspole, i.e. a single ridge pole from front to back, so a side wind will really bend the tent unless you fully stake it out. As it turned out, the only serious wind I encountered was when pitched on a rock platform, and finding suitable rocks to weight down the side guy lines was a struggle (my previous tents have all been fully self supported). Would I take it to Tassie? Only if I could be assured of being able to pitch it in reasonably wind sheltered locations. I trust its waterproofness, but I'm not so sure about the Tassie westerlies.