The Zeiss loupes are hands down the best optics available. With a name like Zeiss, you know they are well designed and manufactured, and also with a price! In regards to weight, the newer models which feature all silver loupes and frames are significantly lighter than the previous model featuring silver frames with black loupes. I do not experience excessive pressure on the bridge of my nose nor strain on my neck. Also, strain on the neck can probably be attributed to the focal length and resulting degree of flexion while using the loupes. For what its worth, I happen to find the DFV's heavier than Zeiss and Surgitel.
Good luck with your decision.