The current BES/Good/Watchdox multi-platform product is unrecognizable from the BES product that existed when Chen came on board. Of course acquisitions were an important part of that, but there has been major internal development under Chen.
I believe the board and Prem are very pleased with how Chen has performed, as I am.
The proof is in the pudding, as BlackBerry is heading towards profitability by the end of the current fiscal year.
As a side note, look at today's news story about Chen:
John Chen discusses why he came to BlackBerry, his future plans and more | CrackBerry.com