Welcome to Sailnet! Undoubtedly you have already visited the Dehler web site
. You should take a look at the Dehler Reviews here on Sailnet
If memory serves, a few months back there was a discussion on Dehler. Aha. Here
it is. If you are looking at used Dehlers (and almost all of us buy used boats), then bankruptcy and a company sale don't have a huge impact on you. Mostly, it can affect your ability to obtain information on old boats and parts only the dealer would have, such as a rudder. Other than that you almost always end up dealing with a Marine Supply store anyway.
If you are looking at buying an older Dehler, this 2001 thread
is worth reading. I don't know of anything else at Sailnet about Dehlers per se, but I recommend that you also take a look at the Buying a Boat
board. This 2002 Cruising World Review
might also be helpful.
These are the only references I have run across. Most of my boat review bookmarks don't yield anything on Dehlers. I'd say, then, that Google should be your best friend when it comes to finding Dehler info. Happy searching!