I've getting close to starting a major addition to our house. I'm going to put some kind of conduit in the new sections of the house for low-voltage wiring. I'm pretty sure I'm going to use the Carlon flexible conduit (the stuff they call "Resi-Gard"), but I'm not committed to it (if someone has a better suggestion, I'm open to it). I'm planning on running 3/4" conduit from all of the boxes back to a central location.
The contractor's electrian wasn't that interested in doing the conduit, but the contractor didn't have a problem with me doing it. I used the Carlon stuff in one room in the basement that I remodeled, and it worked out fine ... except for one issue.
I hadn't fully appreciated how much of a pain it was to secure the conduit to the framing members. I used the PVC "hoop" style clamps, and those worked out okay ... but driving all of those screws took a lot of time, and in some limited-clearance places I was forced to drill & countersink bolts & nuts to secure the PVC clamps. I ended up using a fair number of these clamps, because I didn't want the conduit to move around when I was pulling wire through it.
I have to wonder if I was missing something. What are you supposed to use to secure the PVC clamps to the framing members? Do people nail them? Do you use drywall or deck screws? Traditional wood screws, with a pilot hole? I guess with the rigid PVC, it's less of an issue because you don't need as many clamps. But I had used that in _another_ room I remodeled, and I discovered that I ended up spending a whole lot of time cutting and fitting the conduit with all of the bends necessary (and that room didn't even have that many bends). The flexible stuff was a _lot_ quicker in this regard.
Is combining conduit types an option? I suppose it would make sense to use the flexible stuff where you need lots of bends, but you could use the rigit stuff for long, straight runs.