hi paradise,
let me tell u wat to be wary of, for VG. and let the rest of our fellow btb tell u wat to look out for. hee..
some VG claim they have taken alot of video, but they only show u 2 or 3 of the sample. -- his work might not be consistant, thats why he dun dare to show more. u will know his work style and standard by looking thru his portfolio (some have blog their video)
ask him how many client he took a month. if he take too many, how long he will take to finish his editing and give u your product in time? if he then claim he can give it to u in 2 3 weeks, he might rush his work out and the final product will not be good (like mass production).
try to talk to the VG himself, to know his style. instead of their sales personel who is excellent in sales talk. (they might earn commission from clinch deal)
some VG present their disc in just CD sleeve, while some did theirs very professionally like personalise disc print in hardcover box.
ultimately, u must like him in person, like his style of work and trust him. I have a friend who's AD video turn out to be a disaster e.g express highlight spelling wrong, VG absent sent a amateur to stand in, didn't deliver on time etc.