Wan acceleration

Anyone in the group using hardware based wan acceleration and have suggestions? If so, anyone using it over a static IPSEC Cisco VPN link (or other vendor)? I've seen a demo of Cisco WAAS and why they think it's best of breed. Spoke to F5, theirs is still in beta so they suggested Riverbed. I've been told that Riverbed (unlike Cisco) reverse engineers protocols to allow for pass-through though, which worries me in case of failure. Cisco on the other hand licenses the protocols from the various vendors. Other vendors I'm looking at as possibilities are RocketConnect, RadWare, BlueCoat, and Juniper. My connectivity is a tier 2 Metro E at one site (policed at 90Mbps), Tier 1 OC3 at other. Reply to post, or off list. Cheers, Bill Lewis