I just got the RB400 and am most disappointed that I've been unable, after many hours of trying, to set up the router as a VPN client to a Cisco VPN concentrator. I am able to do this from Linux via 'vpnc' and/or "Strongswan" and on OS X on my Macbook Pro which supports connecting to our corporate VPN flawlessly. IPSec as it currently is on RouterOS is useless to me when connecting to our corporate VPN - and before you even suggest it, no, most of us cannot modify VPN rules on the server side to suit RouterOS' IPSEC VPN client.
Please provide a native solution for RouterOS that supports Cisco VPN/IPSec in the same vein as "vpnc", "StrongSwan" or OS X - this is a must and I am quite surprised this hasn't been done so far. Running MetaRouters and such is a kludge and I'd like to use RouterOS and not flash the RB400 with OpenWRT, if possible.