"Help File" Authoring tools

For the past several years, I've used RoboHelp (ver 5.00.201) to develop help files for applications developed in-house. I'm entertaining the thought of possibly moving to a different development platform.

Our present development environment is predominantly Visual Basic, but we're beginning to transition to some web-based applications.

I like RoboHelp because of its fairly wide-spread use throughout the development community and its ease of use, but I'm certainly not averse to using another product that is just as good, just as simple or simpler to use, and costs less to operate and maintain (upgrade).

I'd like to say that cost isn't a consideration, but that would certainly be a lie. However, "Lowest Price" is not an over-riding factor.

I would appreciate any thoughts and personal experience you have to share. Thanks in advance for your insights.