I bought Gen 1 when they originally came out. When the Gen 2 came out shortly after that, I bought the TIR lenses for $30 and was able to put them on to the Gen 1 modules; turning them into Gen 2 lights.
Now that the Pros are out, I wanted to upgrade. EcoTech has an upgrade program which allows Gen 1 or Gen 2 owners to upgrade the modules to Pro.
One option is to purchase the Pros from EcoTech (which I did). They charged my credit card for the 4 modules.
When I receive and mount the brand new lights, I simply mail back my current Gen 1 lights with TIR lenses and EcoTech will credit my card for the original purchase price of the Gen 1 and an additional $30 for the TIR lenses.
What this amounts to is $270 for each brand new module.
Of course I do pay for shipping.
So, I end up paying exactly what it would have cost for a Pro without loosing money on Gen 1. Plus, now I will have the latest product instead of the oldest product when they come out with yet another upgrade.
Not a bad deal IMO