We distribute for SolarMax so can provide any info required, and will be happy to field any questions. We have had very few returned, and those we have had are replaced directly between the installer and the factory within 48 hours. They have a good range of products and are a great company to deal with.
Only current downside is no (domestic) dual MPP inverter, but they do have a new model (P series) due out in 2013 that will have a dual MPP option to compete with the likes of Power One 3.6 and SMA 3600TL.