What do you actually want to learn?
There's a world of difference between the high volume, production-line "pack shot houses" and real product photography. The packshot people tend to throw light at things from every direction, it makes their life easier and produces a consistency of result that their level of clientele tend to find acceptable.
Real product photographers, advertising and commercial photographers, light and photograph every subject as an individual item, in fact they base their photography on showing the benefits of that particular item, and approach it as if it actually belong to them and was made and designed by them - a totally different approach. In fact, product photography is really almost as much about using marketing skills and other business skills as it is about lighting.
There are very few people running training courses who actually have any real knowledge, many in fact seem to do it simply because they can't hack it as photographers. There are of course exceptions to this, and there are also photographers who run training courses mainly because they like to help people by passing on their knowledge, but in general terms you need to be wary of people who run courses and recognise that not everyone who does so either knows their subject or knows how to teach.
I'm just a fossil, someone who entered the profession back in the days of on the job training with large Companies that no longer exist, and who had the doubtful benefit of working for years for very low pay (unlike the current trend of buying a camera and claiming to be a professional) so I've had advantages. But most of what I've learned has been from experimentation, and you can learn the same way.
