It works very well, and since it’s still an EE installation, there isn’t much to support beyond normal, if at all.
This isn’t true, which is the reason we created the MSM and ceased support for the hack-ish method. The old method, used minimally, did not cause many support issues. But people didn’t use it minimally, they took it to extremes, hack upon hack upon hack, and it could create very complicated support issues that fell well outside of what we could support. People would have 400 sites stacked together and then come in with the assumption that we should support their 100+ site network, for free, based on their hacks. It just wasn’t feasible, not even a little bit.
We have no problem pointing people to the old method on the rare occasion when we think its appropriate but the MSM solves very real issues, very elegantly and its the only one we recommend.
I bring this up Ronnie because I know the solution may work well for you but I would caution you against recommending without really investigating what someone wants to accomplish. People may take your recommendation in ways you don’t anticipate and what you thought was advice meant to save someone a few bucks turns into advice that has locked someone into an unsupported method that they’ve built business critical websites on.