I had the Abus Granit 54; loved it, felt like a bank vault opening & closing for 2-3 years, then abruptly stopped working (key turns, but lock mechanism doesn't move). Someday I'll see if it's got a warranty in effect.
Now I ride a folding bike & seldom lock it; on the rare occasions I do, if it's in sight at all times, just a light Abus armored cable through the rear wheel; if out of sight, I fold, remove seatpost (which holds the frame together) & quick-release pedals & run cable through both wheels & rear triangle. If in Manhattan, OnGuard Pitbull mini also secures frame; I leave it home most days.
So far so good.
Having owned most high-end bike locks popular in the last 30 years (remember the Stainless-Steel Cobra? Huge for about 2 years in the 80s, til they started chopping off the tip with an axe), Abus are definitely better made than most; the US importers mostly market them to motorcycle riders & don't import a lot of things; check UK/European websites for way more selection than any US source &, usually, better prices (despite the decrepit dollar). No stupid scam "insurance guarantees" with Abus, but has ANYONE ever gotten paid by Kryptonite for an NYC bike theft EVER?