The Precort and Colligo terminators are milled from solid aluminum
blocks. Other than the pin and lashing holes there is no open space to distort. There were some pictures earlier in this thread showing Dux around heavy cast stainless thimbles though which seemed to be holding up well. I have a question about that though as Dux really does not like to make turns under at least 5 diameters.
J.P. From a strictly performance standpoint it is a trade
off. Rod has the advantage of low stretch and less windage. Dux can be sized to equal the stretch at the expense of more windage. OTOH, the Dux will greatly reduce the weight aloft. Proper inspection
of rod requires dies and microscopic examination. The signs of weakness in synthetics are excessive permanent stretch, abrasion and UV damage. All three of which are fairly easy to detect.
From an installation
standpoint, professionally installed Dux should work out a little less expensive than rod and is a lot easier to ship and work with. A competent DIYer should be able to get the cost down fairly close to wire. Rod heading equipment
is expensive and not available everywhere. In fact, Navtec headers are licensed and deliberately limited geographically. If a rod needs to be re-headed it would probably have to be sent off. The closest to me is in Charleston.