You can use the Measurement Studio for VB6 ActiveX controls in .Net if you don't have a license for Measurement Studio .Net. Simply add the ActiveX controls to your tool box. Visual Studio .Net will create a wrapper for the controls. I have done this in the past and it works quite well. I believe you will need to force the build to X86 and not AnyCPU if you are working with 64 bit Windows 7.
For plotting large amounts of data I have found the ActiveX chart controls perform better than the .Net ones (this is just my perception I don't have any hard data). The 3D chart is still the same ActiveX control in .Net as far as I know (I haven't used it yet). The other knobs and switches and things like that are very much the same in my experience. The .Net controls do have features that are nice though like hit testing and legends. I have made my own legend in the past using a list view with a colored cell. Most of the analysis libraries are still native since they use the Intel Math Kernel Library (My understanding don't quote me) so I don't see much difference there. I can't comment on the DAQ interface since I don't use it.
To sum up you can convert you project using the old tools if you would like to use .Net. Depending on your experience with VB.net it may even be a good first step just to become familiar with the .Net framework. The function calls for the VB6 version of Measurement Studio will be the same in .Net so you can just copy most of the code that does the analysis from the old software.
