I work for a Small company which sell POS system (windows and Linux) made with lazarus.
Some of our server side services are built in lazarus too.
At this moment we are building an on-line credit card validation system for our clients. And guess what: is built in lazarus too.
But we tell our clients (if interested on knowing) "it's programed with C". AFAIK only one person did that question.
When I was hired the first lazarus project was already started and wasn't very pleased at this time,
mainly because of: not many third party components, many bugs, and things that should work were not working.
Now looking back to november 2008 when I started and things done and learned since then, I can tell you that:
Third party components has increased a lot.
Bugs get solved pretty quick and if not you can find a workaround in the meanwhile.
Things that were not working as expected was due to lack of knowing the Lazarus' way of doing things, or bad design (my fault

or lack of knowhow).
This forum is great! If some one knows how to help you they do it immidiately, and sometimes it gets realy long on someting you thought was a minor thing. If not, then nobody who knows how read your thread, or the question is very silly (I've made a couple of them).
Now if you ask me I don't want to go back to Delphi, and there is nothing I miss from them (it's MY CASE your opinion may vary).
ATM Lazarus is as good as it gets and improves at their own pace and I can live with that.
Now when we face an UNSOLVABLE problem, we stop and think:
- is something we are doing the wrong way
- are there other ways to solve that problem
- are there ready made tools to solve that problem
- or there is technical limitation which prevents us from reaching our goal (if so we go back to design)
When talking to other programmers some times I face their ignorance about pascal and endurance their tries toconvert me from a pagan religion to the religion which says that Moses receive the ten commandments writen in C and Jesus miracoulous JAVA and the holy grail of Python and so forth.
I got used to silly questions like "How does it feels to program in a death language?" or "Pascal? Oh! Kids' programming language!"
After a laugh, I ask them to define "death language" and later I explain why Pascal is not death according to their definition of "death" and making clear that every language has at least one adventage over others and that we are very happy with our choice and the benefits we had with using FPC.
I haven't read the Dutch banking regulator reasons to advice not to use delphi thus I can't any thing about it. But I live in Argentina and we know very well that many of guvernamental decisions like this are taken mainly by corruption (I do not remember a better inglish word to say "some corporation is giving money on change of.."). But again I haven't read their technical reasons.
Every body can do a busines with almost any tool under the tools' license. We are doing it!!!
Microsoft stopped using Delphi in Skype by obvious reasons. Imagine a conference:
MS Anouncer -"We are geting our Skype to a new level"
Journalist -"Which language you used to program it?"
MS Anouncer -"Delphi."
Journalist -"Why not C#?"
MS Anouncer -"...."
just my opinion...