In the interest of honesty I shall get straight to it.

I don't think this product adds any value. I understand the viewpoint that people may swing differently on course to their swings on the range. The majority of golfers understand this. Based on this premis, videoing it will only solidify the fact that they do indeed swing it differently on the course. However, to know this, they must take the time to go and film it on the range anyway. Anybody playing golf who doesn't have the time or inclination to do this in the first place will struggle to improve.

Videoing your swing on the course or on the range doesn't actually provide any feedback as to how to swing it a different way, for example, in order to correct a fault. If it were that easy, forums like this wouldn't exist, and the golfing world wouldn't be saturated with gismos and gadgets that still don't reduce the average handicap. You will be adding to the list of gismos and gadgets. Of course, this is where you have introduced the "lesson" aspect of your product.

This leads to the usage of the footage. As already mentioned by Greg, you have some stiff competition from a couple of well dug-in products in CSwing and V1Home (which provides lessons as well for cheap and only costs about $20 to get in the first place. Ok, you gotta buy a camera, but so many people have one already), plus forums such as this for help and advice and, of course, local pro's that people see anyway. If a person is too stupid to be able to use a simple system like V1, then golf should be the least of their worries.

Really, what is being provided is another tool by which to communicate with another pro for another opinion on what is wrong with their swing. Another opinion is not, in my opinion, worth $150 then $15 per month.
As avid golfers, we already know that we need to try different things to correct a problem and there is a myriad of methods by which to get the required feedback, and the diagnosis and solution can vary from instructor to instructor. One can spend years trying to find the right thing that works. Your product doesn't deliver that. It just delivers another way of attaining another opinion.

Plus, I don't want to add another thing to my bag to carry around with me. It's heavy enough and full up as it is.

Of course, the real crux of the matter is that the difference between swinging well on the range and poorly on the course is a matter of mental application. Videoing a swing doesn't show that up. If a golfer swings it well on the range, he can swing it well. If he swings it poorly on the course, he has lost his nerve and has poor/misdirected focus during play and practice.

After all that, the ability to sell a product and be a successful businessman doesn't necessarily rely on the quality of and necessity for the product. "Ice to eskimows" and all that. If you've sold some already then some people are willing to spend the cash on this. If your target is to get a good income from this gadget, then your seem to have made a start. If your target is to improve peoples golf in a quicker, more efficient, cost-effective manner then this product fails on all fronts, in my opinion.

One final thought. If I'm stuck behind a hacker who's already holding me up and he gets a camera out I'm gonna play a low stinger at his head.

Sorry.

__________________
Luke: I don't believe it!
Yoda: That is why you fail.