From my experience using wanos in a production environment for the last three months I can say that you guys have a fantastic product! It has exceeded my expectations in just about every way. I think the pricing structure in place is fair too, especially considering what Riverbed and Silverpeak charge.
That said, with the limits on the free edition being 6/60 it may be a hard sell for IT to convince management to invest in the plus version with no unrestricted performance data to sell them on. Perhaps the free version can be setup to initially run without limits for a short amount of time... a month perhaps? 30 days is more than enough to give people an idea of how wanos plus will perform in their environment.
With a proper marketing strategy, I can see you guys taking a huge chunk of the WAN optimization market from Riverbed and Silverpeak.