I have the Orion, and it has been solid as a rock for me and we have used it for stress/abuse testing SSA drivers. There are a good number of people that ran it at .5 ohms and have done well. What I am confused about is how a pair of Arsenals are going to get to .5 ohms since they are D4, unless you ordered special versions. The issue with the Orion's was that people did not have the electrical system to support such a powerful amplifier, or they did not have the experience or know how to use it, and then there would be voltage drops and kaboom. So holy crap it must be a crummy amp! Sorry no, user error. john mentioned some good ideas with upgrading the electrical system to support the amplifier. Big3/a few strong deep cycle batteries/ and maybe a bigger alternator. In my opinion, unless you are worried about scores on a TL mic, its not worth it. Run it at a higher ohm load and put less strain on the system and get more life out of the amp and subs.