Well, after months of putting off watching both movies, I have finally sat down to watch them.
I have to say TICKS won me over. I loved the movie. It's like what a few of you said - it knows what it is and doesn't try to be anything else. The Nest is fun too I just found it a little slow in parts. The cockroaches weren't really that fun to watch. I love the monster at the end. And the cool lighting in the cave.
Anyways, for anyone who hasn't purchased these movies, I suggest TICKS over The Nest.