Thanks pal!
Obvsiously it's better to get in touch with them first. I guess he will contact
them shortly to avoid to turn-up unannouced as you mentionned in your post.
All in all the feedback for excellent seems to be more than encouraging so it's
definitely worth visiting them while in HK. I will let ya know about his experience when he will return!
In any case, thanks for your help! It's great!
Best,
Franck