I started that migration out, a week ago, using PleskX.pl route..
It migrated about half the customers, and ignored the others.
So I ended up doing a pleskbackup for EACH missing customer and doing a pleskrestore at the new server for them.
90% of them worked.
Some gave me issues like it would restore 1 domain, but not the other 10 the customer had.
Solution? Delete the 1 domain and re-restore it. then it restores them all
The thing is incredibly buggy for an expensive piece of software. I had to change the permissions of &%&/% /bin/xxx (edited to prevent hackers) to get it to do some stuff, I had to work around its bugs , had to write numerous pieces of code, SQL trains to update things. Yet, Parallels is blissfully unaware because I do not have a service plan, no way I'll pay to report their bugs..
If I succeed in hosting, it would be despite Plesk, not because of it.
I hope after your sleepless nights you will now sleep.
I can understand you fully since I've been dealing with their crap for years as well.
And unfortunatelly I am dealing with the cpanel crap as well ...
I have to deal with 2 peace of craps simioultaneously.
But parallels is even worse as you quote than cpanel, because if you want to report their bug you need to pay !
This is legendary ... Really ! It needs guts implement not just think of such a terrible act.
At least I don't feel that I am the only one who continiously has a problem with their mess and experiences sleepless nights ...