I opted for the cheapest model as all four are optically the same. My first impressions were overall positive, the loupe came packed in a large cardboard box which contained a pelican-style case (with a manually activated purge valve), cleaning cloth, carrying case, wide view adapter, some papers, and the loupe itself. It also came with a set of formed foam to transform the waterproof case into a case for 4 watches, which was a very nice touch. One complaint I did have was that for the high price, I expected a genuine Pelican case (which cost around 27 dollars on Amazon) with their automatic purge valve.
I'd been using a Belomo 10x triplet loupe for a long time as I love to see the very minute details of the movement. However using the 10x Belomo required lots of light and there was quite a bit of distortion around the edges. The Loupe System is "only" 6x which is pretty standard as a watch loupe. True to their advertising, it lets in plenty of light, has very low distortion, and is very sturdy. On the down side the loupe is positively huge and not pocketable, but neither is a 400 mm f/2.8 lens. Build quality is quite good, with the rubber casing being easily removable (presumably to lower production costs so that the alligator, carbon, and rubber can be interchangeably placed on the same inner metal loupe). The metal housing feels solid but does not have an ultra high end machined feeling, but for the price and presumably low production this isn't surprising.
I think the whether the loupe is "worth it" is a personal question. There's no doubt it costs as much as an overhaul, or high quality alligator strap, but the quality of the loupe is unmatched. I see it as the Patek of loupes, overpriced perhaps, but if you must have the best, it's the only game in town. If the features of letting in a lot of light and almost nonexistent distortion is important for you as a collector to authenticate dials or appreciate your movement with a wide viewing angle, it'll likely be worth it for you.
Loupe System says an attachable LED light is in the works, if properly made with soft lighting this could provide a lot of extra value to the loupe allowing it to be used for high quality viewing and photography in any lighting condition.
Available at: http://www.loupesystem.com
