It's consolidated in that multiple VMs can run on a single host and have a single point of management.
5.1 SSO is a disaster, it was re-done for 5.5 and improved again for 6.0. VMware even recommend upgrading directly to 5.5 and skipping 5.1, and we are now planning to upgrade to v6.
Personally since 2012, and in my current role only a few months.
There were no major issues.
Not really, as 5.1 has been out for a very long time, and any stability issues have been ironed out as with any product.
Upgrading from 5.1 to 5.5 is the biggest issue.
Customer Service:
Very good and the communities help a lot too.
Technical Support:
Very good and the communities help a lot too.
The solution in this company started on v4.1, and has moved to v5, and is currently on v5.1. This was to do with keeping with in support and being able to use new features.
With v5.1 you have to consider the various roles and how you wish to deploy them. SSO, Web, inventory, vCenter can all be installed together, separately, or any mix in between, and even physically if you wanted. I have inherited this design, and I would have done it differently, but as time passes, best practice is improved.
All this was done in-house, with the help of specalist consultants, I have inherited this role and the environment is currently in flux
For the company very good, as they run loads of different applications at the same time
If you can go for enterprise plus, do so as you get access to the VDS and all the features it provides, esp LBT and NIOC.
Hyper-V is gaining traction but VMware is currently still the way to go.
Plan it properly and skip 5.1 if possible. I would avoid 6.0 until Update 1 is out, so any initial bugs can be ironed out.
Having vMotion independent of SSO would be a great thing but more than like would take some code rewrite. Love that idea though. I see a bit of lag in the Web Interface but not nearly as much as previous versions. Not sure what web browser you are using but I find Opera works very well with the Web UI.