Paying for virtualisation software seems unnecessary when VirtualBox does it just as well for free.
It does...until you actually use the various apps. Virtualbox is the slowest and less stable of the bunch in both OS X and Windows. Some features it lacks (especially 3D graphics support) and some features don't work that well (usb and networking for example). All in all it is a nice application to use if you have simple needs when it comes to virtualisation. When you need more than that (3D for example, certain networking setups) you definitely want to buy something from VMware or Parallels.
Any reason why people just aren't using bootcamp??
Bootcamp doesn't support anything other than Windows. Getting non-Windows stuff to work can be a PITA or even impossible (especially if you want it to run next to OS X; if it is the only OS on the machine than there is not much of a problem). Also, you can't run more than 1 version of OS X. If you want to run more due to testing you can only do so by virtualising OS X.
I was running Fusion Pro 5. The upgrade to Fusion Pro 6 was totally painless. I chose the "lite" version without all the McAfee crap. My WinXP VM booted right up without issue.
That's only the different download option. The license is valid for both the light (Fusion and only the Windows VMware Tools version; the others will be downloaded when you want to install them) as well as the full blown version (comes with Fusion, all the VMware Tools and McAfee). The only difference in licensing is Pro vs non-Pro.
Unlike a lot of posters here, I don't resent the annual re-up, nor do I resent there being two versions.
Neither do I as long as it has useful features. When compared to Parallels 9 it simply lacks quite a lot of nifty features which makes Parallels 9 much more attractive. When compared to Fusion 5 we see almost no difference. Windows 8.1 and OS X Mavericks already run fine in 5 and 5 runs fine on Mavericks. Performance and stability is not different either. I really haven't seen anything different when I was running the Technology Preview besides the new "add vm" window. And that new window isn't an improvement for me because it makes my workflow longer (I have to click more).
However, Fusion 5 is a nice upgrade if you are running 4. Fusion 6 is too and since that is the version you can only buy right now...
I want VMWare to continue offering cutting-edge capabilities together with stability, and that costs money.
I want them to do that too but it is very clear that they have put the cutting-edge capabilities in their vSphere products and not in Workstation and Fusion (it's not worth upgrading from Workstation 9 to 10 due to the same "no difference"). They could have done much more. Improve graphics performance drastically. Do something like Parallels and add start8. Add the ability to use firewire and thunderbolt devices (this is THE most innovating thing in any virtualisation product for quite some time now; it makes people very curious how they've accomplished this). Put in some gestures. Expand the functionality of the vm library so that it can do the exact same things as you can with Finder when it comes to managing the vm's (this is actually one of the more smaller fixes).
If they were really trying to do some cutting edge...ditch Fusion and port both Workstation and Player to OS X. Lots of people are requesting the feature set of Workstation while others want something cheap and simple as Player. Workstation has some nice features like being able to connect to ESXi and manage it (due to lack of management tools for OS X and Linux this would be awesome).
I'm missing that kind of cutting-edge innovation in Fusion. And I'm missing it in Workstation 10 too although I can understand that a bit more (how much more innovation can you put in a desktop virtualisation product?).