Firstly, generally it’s fine – works behind the scenes – and ‘just does it’. Disadvantages are that it’s php based, and I don’t know php. This makes modifying it a pain.
In addition, all my permalinks are slightly different. This unfortunately means I’ll have broken links within the site. This should be minimised as the old site is still there (and some links will go to that) – however, it does mean that the internal consistency isn’t what I’d like, and I can’t see a fast way to fix that. The only method that springs to mind (short of lots of programming, having first taught myself HOW to do it) is to scroll through and check links manually. A bit of a pain, and I’m not going to be able to do it anytime soon…
… so, I would appreciate a comment if you see a broken link (or if the link suddently changes the look of the thing, that means you’ve gone to the old site). I’ll fix anything commented as a priority.
If you imported all of your content to wordpress, you won’t have link problems, unless you hardcoded links in your articles to other articles on your site. I know no way around that, regardless of the platform.
And PHP totally rocks. Perl sucks so very bad — as does MT (just wait till you try sending trackbacks to MT sites. Just wait.)
(Edit: The issue is the handcoded in the articles…. As a workaround I’ve got a redirect from the MT directory, and anything that doesn\’t have a correct link (most things) will get a 404 with built in search suggestions – Murk)