.NET adapters for RPG service pgms

Our shop has been adopting VB.NET the past two years or so and that has
created interesting situations being we have developed nearly 100% of the
business logic in RPG already.  To get our .NET programs to talk to the
iSeries we have made sockets calls from the PC to the iSeries, we have setup
RPG web services for VB.NET code to consume, we have used stored procedures,
the list goes on.

Then we stumbled across a product, Attunity, that can have your .NET
programs call RPG service programs directly without having to do additional
RPG or VB.NET development.  It works similar to Java and PCML in that you
have a visual editor that you specify the location and parms of your service
program and behind the scenes it creates an XML config file that will
facilitate the interface between the two programs (VB.NET and RPG service
program).  We also found a company called iWay that has .NET to procedural
language adapters that we just had a demo on yesterday. 

Our biggest concern is that we don't have to formulate our RPG service
program sub procs to look a certain way in order to be called by these
adapters.  We want to be able to pass data structures and use our native
data types without forethought as to who is going to be using the service
program in the end.  This has been somewhat of a challenge with Attunity
(they are working on a fix) and we will have to see how iWay goes. . .

So here's my question. . . Has anybody implemented these types of
technologies to call your RPG service programs (emphasis on service
programs)?  And if so have you been satisfied with the product and has it
saved you enough time to justify the cost of purchase?

Thanks in advance,
Aaron Bartell