If you buy only one additional synth plugin for Orion, this is the one to get. The PPG has such a broad range of sounds that you could use it for anything. If you are looking for an additional synth to add to your already available pile of plugins, the PPG can add sounds to your arsenal like no other synth can. The PPG Wave 2.x is definitely a plugin synth with a very high "want to have" level.
Read the full review on Orion-central: http://www.orion-central.com/reviewppgwave.shtml