That's what Zyxel Denmark told me from what I can remember. The P2602HW was supposed to replace kit like the 660 when I bought it - I was the second person in the UK to get hold of one (guruchill on adslguide was the first because he didn't care about getting a UK power adaptor ).
I've has fun with Zyxel and their model number conventions (interesting info at the end if you cannot wait
). There existes a 660-HW-D1 v2. Zyxel initially denied this, until I apologied for having downloaded the relevent manual the night before and having seen a v2 firmware update.
Turns out this v2 is a minor update, but I cannot find out what difference there is...somebody did tell me that it has a faster CPU.
There will be a redesign soon as Zyxel combines its home and business lines...that's when there will be a 'proper' v2. No plans to bring it into the UK at this time.
The day after I buy one (has a GUI to die for) that is when I will eventually find a DG 834G v4 and Zyxel will decide to import the later v2. Story of my life...
I used to be undecided what to buy, but now I'm not so sure
.