Is the 2014 version of Flexera's AdminStudio Virtualization Pack any good?
Also, I believe the virtualisation stuff comes in a separate edition of AS. I don't think there's an add-on pack. You may have to buy upgrades and re-install. Don't quote me, though - most clients I've worked for have just bought the Enterprise edition.
App-V v5 to v5 SP3 will not yield a huge amount of extra App-V candidates. (if its v4.6 to v5 or v5 SP3 that would get better results)
If you are doing a number a month, (what number) it sounds like BAU, so 10, 20? I would say No, don't get the pack.
The virt pack is an add on for all editions of AdminStudio even in the latest enterprise edition (Thank you Flexera), if you are buying AS, I would argue its possibly worth shelling out the extra few £$€'s at the time. BUT it will not do all of your apps for you in a heart beat. Also you said your client has some licenses, you need to watch the AS licensing model, its is a named per user model, so if its installed on a machine, only ONE person can use it. If someone else logs in and uses it, technically your are in breech of the licensing.
You mention the sequencing tool, technically it converts MSIs into App-V packages, if its an exe, essentially you do a capture, convert the ISM to an MSI, then convert the MSI into App-V.
It would be immensely useful if you have just finished packaging in MSI format ALL of your applications for Win 7 or 8, then at the last minute the powers that be say, "hang on, we now have App-V licensing so were are going to App-V ALL of our apps." (of course other application virtualisation options are available, also catered for in the Virtualisation pack), now you could just run your fully functioning packages (MSI fully configured with MST) through the conversion and you would have App-V packages.
Assuming you (or the vendors) do not use a lot of CustomActions, they don't get processed during the conversion (it flags that in the report). Which can make it very hard for the conv to figure out where to put the files and figure out what the shortcut is supposed to point to. You can fix that by dropping the CA and sorting out the Directory table properly, but yawn, you might as well sequence it. Then you have the next discussion point of, are you using App-V streaming applications?? if so, are you going to use FB streaming to optimise it?? Cos the conversion tool doesnt handle that (well it didn't, maybe it might now)
Also on the conversion tools, (yep all of them Flexera and other vendors) you get sold the 100% or 99% effective, but then the tech guy will tell you about the 'false negatives' and the 'false positives'. False negs are better, I think, as you can convert them, or sequence them and it works, Yay.
In my experience every single false positive has been immediately deployed to a directors desktop, then its discovered to not work properly, shameful testing I know. But it can make you look a bit of a plum. Its normally pushed through for the director, green, tick, convert, deploy. Oh, now you understand the phrase 'false positive'.
Punchline, not really worth it.
The places we have used it, we get Level 1 people to run apps through, if it works good for them, if it doesnt, then it comes into the packaging queue for the big boys to look at (most follow this track).