Talking of U-Locks, I think this is the same guy posting as "CaptainCropper" at StupidLand - I mean BikeRadar. He's talking about the Kyrptonite NY3000:
http://www.bikeradar.com/gear/category/ ... 3000-10498
I attacked one of these for ITV a few weeks back and generally speaking it's a resonable lock for the money. 16mm shackle meant that cropping with 42" croppers was ineffective, I tried a twist attack with a scaffold pole but ended up breaking the ITV bike.
So far so good then? Not really, one I got home and had a play with a 3000 I had knocking about, I found it was succeptible to jack attacks and hammers, the locking mechanism inside is mainly plastic and any self respecting theif will have had one apart to find weak points (plastic melts n'est pas?). I was also disappointed to find that the bottom of the key cylinder was brass and had no anti-drill capabilities. In addition to this, the design of the lock mechanism means that once one side of the mech has been breached (for example with a jack) then the whole lot slides to one side allowing the lock body to be easily rotated out of the way and removed from the bike. Compare this with the Abus Granit 59's square shackle system that makes spinning the body off impossible, and we soon see how important design can be.
All in all not to shabby a lock for £60, if Kryptonite introduced some anti-drill measures to the lock mech, it may have scored a 4. Fill the D with wheel and minimise the amount of space available and it makes a reasonable lock for the money.
The melting thing doesn't seem too bad to me - a thief using a blow torch is going to draw a lot of attention to himself - it makes more sense for him to look for an easier target, which a lot fo what locks are about.