I work for a company that is a dealer for both Lenel and Software House.
This is a good comparison. The point of open hardware being one of the bigger differences is true.
The good part of open hardware is that the end user can switch to another software platform if they get frustrated with Lenel. The good part of proprietary hardware, as Software House has shown, is that they control the hardware development and are able to bring hardware enhancement to market more quickly.
I support small, medium, and large systems on both platforms. Each product and each manufacturer has good points and issues. One of the prime determining factors should be the functionality that the customer, the end user, needs and the capability of the dealer to deliver and support a system that functions in the manner that the customer expects.
Point - the software support agreement for a small Lenel system is in line with the Software House support costs. Throwing in the cost of software enhancements isn't a reasonable comparison unless you add those costs into the Software House side.