Here is a scan of one of the negs I shot. It's a bit blown out in the highlights, more due to the scan than the neg. The instruction to develop for 'one speed faster' than the manufacturer recommends in Ilfotec DD-X is a good one for these low light situations.
As far as I understand it, the normal ISO of the Delta 3200 is around 1000. This was shot at 3200 and developed for the 6400 time. The negs are very easy to print with plenty of detail in shadows and highlights alike.