I've tried other components, and found them rather complicated. JDiction is much easier to use and, more important, explain to end users.
I've already made a couple websites so I've got a little experience, jDiction really makes translations alot easier.
As for the support, I've never seen developpers reply so rapidly and willing to help. I had a problem (of my own making) and jDiction team (Harald) helped me out, replying within the half hour and even going to my website when I gave him the keys.
I VERY strongly advise those who want a multi-lingual site to use this marvelous tool.
Jdiction was not working with phocagallery (an other extension to display photo gallery), I asked the question in the forum and I was provided with a solution in less than 30min.
The extension is quite simple to use once installed, I strongly recommend it!!
The mod didn't work for me on installation, so I sought help in the forum and received a very quick response. The dev team logged into my site and fixed the problem very quickly and effectively, and now I have a great translation system. Works on all aspects of the site - articles, menus, SEO, and so on. Fantastic mod, thanks guys.