It's an EAI tool. A medium sized player in a large market dominated by IBM, SeeBeyond and increasingly Microsoft.
It's technology is highly regarded, but as with most EAI tools they all will do the job if implemented correctly. I've heard of horror stories with Webmethod projects, but all to do with implementation rather than the product.
One issue is that because they are a smaller player, getting skilled staff is harder than with the larger vendors.