Not that simple. While a person claims it comes with mounting brackets, how are you going to attach the bracket to the car? If you plan on using the existing mounting locations from the Neuspeed FMIC which you had to drill into the radiator support and install nutserts, you need to get a bracket made to use it and have it welded to the Vibrant FMIC, or you'll have to find another suitable location to mount the FMIC to, using the supplied brackets.
If there is a dimensional difference between the 2 FMIC's, ie the Vibrant is shorter, and the Neuspeed couplings don't reach, as well as if the Vibrant code is thicker, as well as the Neuspeed End tanks are a little sweep back for the coupler... chances are the Neuspeed silicone coupling won't work, so you'll need to make it work by sourcing out universal silicone couplers, and probably get some pipes bent.
Paying more upfront means you paid someone to figure out how to install it when you bought it, vs making it work on your car as a one-off job, especially more difficult if you don't have the means and materials to make it work and pay a custom shop to make it work for you... then when you compare the $200 initial cost of the intercooler AND the unknown cost of finding a shop that will custom make the parts to install it, is it still less expensive than say buying it from GTI Jake himself?