(A general question, really; I could've picked other comparable models from their respective series.) Does anyone get why the Clipper Creek CS-40 is so much more expensive than the HCS-40R? (Or, perhaps -- why the CS-40 is still offered at all?) They appear to have very similar capabilities. The CS-40 is designated "commercial", while the HCS-40R appears on both "residential" and "commercial" lists, but that seems to be arbitrary. The CS-40 has the same styling as the even-more-expensive units that allow for access control, but it doesn't have any of those features itself. And the CS-40 is apparently UL-certified, that favorite issue of some folks here, while the HCS-40R doesn't list that. But is that really a thousand-dollar difference?