Trying my best to be impartial and simple, I think there are 3 categories of web connectivity products for U2.
I don't want to open up a whole can of worms, so I'll just comment on a few points.
mvInternet is a bare connection. You have to parse your own input data, maintain your own state and generate everything from the Content-type header to the final HTML/XML tag. So it's not 100% a roll-your-own soltion, but you do need to know enough about HTTP, CGI, HTML/XML and ECMAScript to generate your pages.
I have yet to run into something that I cannot do with Web Wizard. There have been some tasks I've not been able to do with pure API calls, but you can very easily work directly with HTML and even mix API calls with raw HTML.
Regarding integration, as long as the other tools follow the HTTP/CGI standards, Web Wizard works with them. We have customers using Perl, PHP, Cold Fusion, Java, JBoss and even DataTel's WebAdvisor to interface with Web Wizard programs. At the OS level, it's trivial to make calls to LDAP, post/fetch data to remote servers (even using private keys), generate PDF and RTF files, etc..
Finally, we've not encountered any real scalability problems either and we have universities that run their online registration through Web Wizard and that's one of the biggest click-fests I can think of. The only times we've come close scalability problems have been when the database server is already running at nearly it's maximum capacity (CPU load, number of licenses, etc.) and any tool would have encountered the same limitations.
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