condensation is almost unavoidable in about any tent if the conditions are right (atleast all the tents iv used). Atleast in a single wall shelter like my paratarp i can wipe it off easily. A little rag run over all the sides works well to keep the drips off while i open up it up to air out or start up the stove.
I get condensation in my paratarp, but no more or less than any other tent iv owned. The only tent i can see there not being bad condensation in is a solid double wall tent. Like a kifaru with a liner, hilleberg, or other real 4 season tents.
A bivy has replaced a floor mat for me. I slept on soggy moss covered ground this weekend without a groundmat, also i forgot my sleeping pads (with 20 degree low that night im suprised i stayed warm) and didnt have a problem keeping myself dry. I would be taking a small mat for my stuff had there been snow on the ground.
Another good thing about a bivy is get one with a bug net, then you are bug free while you sleep. Bugs otherwise havnt been a real problem with my paratarp, they come in, but they can get out when they want to and are not trapped.