Wrapping it up...
Although the original Linky (SR41) and all its variations have put Linksys at the top of the SOHO router heap, the design was showing its age and it was time for a change. Linksys hasn't said so, but I suspect the SX's Conexant CX82100-based design will become their new, next-generation platform, on which most routers for the next 12 to 18 months will be based.
The SX41 looks like an excellent first member of this new generation. It allows Linksys to play the undercut-the-competition game, but in a higher-priced category (VPN endpoints) that should allow them to stay out of the under-$50-mud-wrestling-match that D-Link started with their DI-604.
If you can do without scheduled port filters or forwarding, and don't need email alerts of "hack" attacks, the SX's performance and features make it the obvious choice if you need to have a VPN tunnel to only a couple of remote locations. And at a street price as low as $73 (at time of review), you better grab one quick before Linksys realizes what a steal you're getting!