They hiss insanely and also they fail too often. They do sound great, though. Probably these issues were fixed since, but their price also has gone up from 799 to 999 euro recently.
Well, not all facts are correct as of now.
1. They do not hiss any more.
2. Type 07 MK2 has room correction and different DSP settings now. Thus, has DSP. Jury is out on whether it is a good or bad thing. But everyone using DSPs now, so take it or leave it.
3. I can easily source them for 800 EUR in Australia right now. It may be a clearance price or similar, but it is the fact.
They do fail a lot though. It is true. I guess the electronics in them is way too complex hence why they fail. But it looks like the newer revision of the electronics is a lot more reilable. HEDD offer three years of warranty.
Coming back to the subject of price. The cheapest Neumann 150 are around 1800 EUR (around $3000 AUD) per one monitor. Making them twice the price of HEDDs. They are extremely popular now though. Number one neafield monitor on Thomann, despite the price. (Or maybe that is one of the reasons of such a high price tag). Type 30 MK2 can be had for such a price! (As off Feb 2023 this may change later)...