If you have installed the trial or full version, you will need to use the Add VST plugin path in the program settings to include the install location of Ignite ie
C:\Program Files\FXHOME\
The Ignite installer does not appear to detect VPX - the same goes for anyone using Ignite with Movie Edit Pro versions that support OFX.
Is it worth the money? I would suggest you use the trial to determine this.