They're roughly similar in overall output to Inon S220s, although the Inons have a wider beam. They also seem to have a proprietary mounting system for SeaLife's flex arms, although I believe adapters are available. SeaLife in general seems to be very USA-focused as a brand, with little presence in other markets. That said, while I don't have personal experience, I don't think they have enough power to shoot wide-angle with an APS-C camera - you really want something along the lines of Sea & Sea YS-D3 or Inon Z330 for that. Compacts shoot at wider apertures and can make do with less powerful strobes, but the larger the sensor, the more strobe power you need.