Had a couple of issues, which were responded to swiftly by the developer in the forum (i.e. within an hour). Turned out the issues were due to me having the site .htaccess protected during development, rather than GTranslate.
That was two days ago. Today I received an email from the developer with the latest release attached as a Zip (no hunting / checking a site for downloads). This version is a pearler: i) Now uses a Google API (you need to get your own but that's easy enough) allowing translation of up to 100,000 characters a day. A new sophisticated caching system means that changes to pages will only require asking Google for translations of any new words should mean that, after initial translations, the load on Google is keplt well within the character limit. Some users of the previous version had run into trouble with the number of requests being sent to Google and translations were suspended for up to 10 days. Hopefully this will avoid all that. Now for the killer feature: the ability to edit the translated text, so that if Google doesn't get it right you can make manual edits. I'd previously planned to use Joomfish on this site but I really can't see the need now. This looks as though it's going to save me masses of time (and save my clients loads of money!) Following today's release I had just one question to ask the developer (about cacheing) and it was responded to within 10 minutes. Not the cheapest extension I've ever bought but in terms of what it can do, it must rank highly as one of the best value.
i) Ability to upload your own icons for different forum sections etc.
ii) In-editor previews of posts
iii) Fantastic support - the support folk will bend over backwards to help sort out issues for you - even if they are caused by things out of their control such as the template you are using, or other modules. A real personal touch - becoming quite rare!
The developer is responsive to any support queries via a forum and is actively improving the product based on feedback. Yes, it's a commercial product but, quite honestly, not a lot for what you are getting.