Yes I do and yes it is worth taking.
To clarify a bit, my "screen" shelters have evolved over the years......
Version One - A large (16'x12') tarp with mesh walls attached with clips and gizmos (a home made version of the Eureka VCS before that existed).
Worked ok but the tarp required heavy poles if you didn't get lucky and have appropriate trees. Not great in wind and rain but ok at keeping bugs out.
Version Two - A tunnel type non-free standing floorless group shelter from Woods, mesh walls and doors, pretty good at keeping the bugs out and roll down covers for the mesh walls. Came with crap fibreglass poles which did not last very long, reasonably good protection from bugs and rain, terrible in windy conditions and a pain to set up securely if the site was not "perfect".
Version Three - A Sierra Designs freestanding floorless shelter (9'x9')with large areas of mesh. Very good for bug protection and pretty dry as well. OK in moderate winds, not so good in high winds. I would still be using this version except the insanely long (6 feet!) zippers eventually failed (pull replacements kept it going for a few more trips), the pole system it came with was excellent and the total weight was manageable (about 10lbs)
Version Four - Haven't acquired this one yet but I have a few options I'm looking at. All the options are heavier and larger......
Future options:
MEC Chowhouse - A friend has one and we have used it for a number of trips the last two years, not too heavy, excellent bug and rain protection, not enough mesh for my liking and just a bit too large (10'x10') to be easily set up in bushwack type camping locations, free standing so works on beaches.
MEC Screenhouse - Similar to above but more basic design, lots of mesh, freestanding but a heavy bugger, all four side have individual roll down covers for rain protection (when using the optional fly).
LL Bean Screenhouse - Similar to the MEC, heavy but cheaper than the MEC, optional full fly not quite a nice as the MEC. Also comes with a removable floor which would be good for mucky situations and/or extra bug protection and possibly better performance in wind.
When I'm travelling in peak bug season (June, July and early August) in northern Canada I don't think I could handle being trapped in a regular tent. I basically live in my shelter, I always have a regular 2P tent but that is only used when the weather is really bad or when a lack of space prevents the use of the shelter.
In early Spring or late Summer/Fall I sometimes trip without the shelter and bring a tarp for rain protection but during bug season I wouldn't trip without a full shelter.