For the price (usually on sale for about 40€ or less) you get very high-quality effects. The only thing missing is a Parametric Visual EQ like the stock one installed in Pro Tools. Otherwise this collection is essential for you if you want top-sounding effects.
I have it for a very good price here @ KVR, I try every FX, one by one, they're doing the job really well. The whole bundle sound very good but i will not say it is creative, the interface is not helping it. I own the 2 creative bundle from Vengeance sound, and honnestly the vengeance are just better, not for sound, each bundle have their own 'print' but the interface of the Vengeance are more design to be used a creative way. If you don't already own the Vengeance so the Air collection will do the job, but if you have more budget, just choose the 2 vengeance bundle ;)