They make some nice variety, here's a small willow on the left, and a large Oak on the right.
The large willow on the left is somewhat less convincing and needs a bit of work I think.
These trees also come with these bases, the idea being you can paint and flock these to match the tree base, and then move trees out of the way when troops enter the base. Or you could multi-base the trees which I also like the idea of. I haven't decided what to do with these yet.
Plus some walls from a local supplier. Just a quick paintjob in grey for a start, will do the bases later.