The more "units" you wrap, the more you will appreciate a better gun. My first gun was an inexpensive gun the Dr Shrink use to offer, As Danielcooper9 stated it did not disburse the flame at all. I used to put a lot of hole (Still put some). The second problem I had with that gun, was it was not a one step ignition. You open the valve for a pilot light, pushed the lighter (Much like a grill), and the pilot burner lit. When you wanted to shrink the film, you squeezed the trigger, and you had heat. When you need to set the gun down, you had to shut off the pilot flame. Also to add an extension you need to break out the wrenches.
The gun I have now, squeeze the trigger and you have heat, To add extension push a button remove the head, and the extension. All quick and easy. Also the heat is spread over a larger area. Jobs are done quicker, and the job come out looking better.
If you were closer, I would say I would show you both guns, and let you play with both to decide for yourself. I still have the old one.