Firstly I use Delta's car windshield repair kit
and probably chose them for the candy (hint to Jeff, send more candy
However, A golf analogy that might apply here concerning choice of equipment....
I am, by no means, a good golfer. Upgrading from a set of inexpensive clubs to the "best money could buy," did nothing to improve my game (although I at least "look" impressive
However, a good professional golfer, with even the cheapest set of "off the shelf" clubs, would more than likely have the knowledge and experience to use those clubs to his/her best advantage and play a round that comes close to his/her normal score.
Now, give that pro a great set of clubs designed specifically for him/her and I would bet that you could see a marked improvement.
So, I guess the convoluded morale to this epistle is that if one takes the time to really learn all there is to learn about the repair system they purchase and one continually practices his/her repairs, the result for one's customers should be the best quality repair that could have been made.
So, I would suggest that you choose a system from a reputable company that provides plenty of support for their product and start repairing those windshields!
Once the cash flow is there, you can always blow a couple hundred bucks on a different company's bridge/injector/resins and do your own comparisons.