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I've been using Einstein's since they were introduced. Although it was a bit of a hassle, the original issue with the weak mounting fingers was fixed at no cost. Coupled with the Mini Vagabond, they rock. Having said that, I've started using Cheetah CL-360's for most of my location work. Like the Quantum's, they're a bare-bulb flash. Unlike the Quantum's, they DO NOT offer TTL capability. The power pack for the Cheetah is lightweight, and capable of firing something like 600 full-power pops. Cheetah and Einstein offer offer proprietary triggers that are very reliable.