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I have made and used both. I currently use a truss, mainly for ease of transport: + the Police no longer question me about the cannon!
My 12" scope packs down to a small esky in size, and I can set it up in a couple of minutes without any tools or loose bits. Normally the collimation is fine. I use a shroud most of the time to minimise dust and extraneous light. Tube currents don't seem to be an issue, but I often leave the shroud up a couple of inches above the mirror for a while to assist in cool-down (I use 2 fans as well).
My only issues with the truss are that because it is lighter it is more susceptible to wind, and balance can be a bit trickier.
However, if you aren't worried about size, then the $500 saving sounds good.
With regard to CF tubing, my understanding is that there are no problems with thermal effects. I use aluminium tubing (straight from the rack at the hardware store!), and have had no problems at all.
All the best,
- Dean
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