Primochill tubing is primarily comprised of silicone. I've used it for years, and am building a new rig using 3/8ID 5/8 OD UV blue and UV green. Previous rig used 1/2ID 3/4OD UV Blue.
Advantages:
Good bend radius, esp. 3/8ID 5/8 OD
No need for UV die.
Long lasting
Even if there is a bit of "clouding" going on, you can't see it anyway.
Disadvantages:
Major dust magnet. The outer surface is quite sticky.
Same sticky outer surface resides on the inner surface too, so that means there's probably more flow resistance compared to same ID of PVC based tubing. This would likely be very difficult to notice since we're not talking about very long pieces of the tubing in the typical loop anyway.
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