They have a very nice range of shoulder pads and other bits that are compatible with Warhammer 40k. At the moment it looks like they are focusing on shoulder pads and things like storm shield replacements but they are expanding over into custom vehicle bits as well. Check out this thread over at DakkaDakka for some CAD drawings of some Predator armor they are working on.
These guys look like they are doing solid work and hopefully their line will continue to expand. I will probably make an order in the next month or so and let you know how their stuff holds up in person.
Be sure to let us know if anyone has any experience with any of their product!