Everything will work as well as it did when it was first recommended (can I interest you in buying a PC from 1996? It works as well as when it was first recommended), and there are reasons why SID and AID are no longer recommended. Not only can you end up with an outdated version that is susceptible to being overwritten/disabled accidentally, but you can end up in situations like the OP where the softmod won't uninstall correctly, and both of these situations will ruin your Xbox. I don't think that I've ever read about anyone having problems like this with krayzie's ndure, but there are tons of people who have these problems with SID/AID. There's a reason why the XBE Exploits forum only has stickies for krayzie's ndure and not for any other softmod packages. As I mentioned before, there's no reason to purposely use SID/AID over krayzie's ndure. I can understand if someone had never heard of krayzie's ndure, but anyone who has should be using that instead, and yes, SID and AID should be forgotten about.
I'm also not sure why you wouldn't have access to the krayzie's ndure softmod packages. They're available from the usual places, and if you can't get it from there, I found them quite easily by googling "xbox krayzie's ndure download".