The Good: The material of the saddles is top knotch, no doubt there. As well as the overall sound improvement, better sustain, no more metallic sounding high frequencies and no more string slipping while playing your beloved Offset guitar...
The Tusq saddles are easy to intonate, there is no more rattling of the bridge saddle height adjustment screw as the tollerances are far lower on these then on your avarage stock metric bridge...
They can be also set to any neck radius due to their individual hight adjustment. (Something you can't do with a Mustang style bridge)
The Bad: Since the saddles are made from a non conductive material, being synthetic Ivory, this means you have to find another way to connect the ground wire (as it won't work anymore on the bridge post) or you will get serious buzz otherwise.
Second; the bridge barrels are about 9.5 mm width, as the Jazzmaster/Jaguar come with 10mm saddles (MIJ/CIJ/SQUIER) this means the outer Tusq barrels will be pushed inward. This also means that for the US made Jazzmaster or Jaguar with their wider string spacing this will be the case as well. You might find this a bit anoying if you want to use lightergauge strings.
In short, if you don't mind making a new ground connection (preferbly on the trem plate, like the vintage Jazzmasters and Jaguar's) and you have no problem with the smaller witdh of the Tusq saddles, then get these. Or if you don't have a guitar with a 7.25" or 9.5" radius, then the Tusq's are your best option as well.