I've read that a vocal booth even at 8ft by 8ft ist too small... keep in mind that this is a video production house.
This would be Ideal for me and my Video production setup i'm trying to upgrade.
i would rather say a 16f x 16f booth is the minimum for vocal recording if you want to record with some room ambience (wich is the best), but it can do the job on some applications.
It all depends on how the lows and lower mids are being handled. If they're allowed to pass through, it'd probably be okay for VO work at least. If it's of "standard" construction and covered with foam, I wouldn't want to be in there...