After owning this lock for 6 months and loving it, here are my reasons why I switched.
Living in the big city and riding bikes, owning the best lock available is the most important step to keeping the bike in your possession. Kryptonite does this well. Very well. They offer all sorts of strengths depending on your threat level of getting stolen. Considering that I would have to leave my bike locked up downtown for hours on end, I'd figure mine was pretty high. So naturally I bought the strongest they had, New York Fahgettaboutit and boy was that beafy. First impressions, hand down it's the strongest and toughest lock. Extremely sturdy but it wasn't the right lock for me. Why ?
First. It's shankel is shorter then this one and while that's done intentionally to prevent jacks from being used to pry open your lock, it realistically means that you are really limited to what/where you can lock it up. And once you locked it up you could only lock up the frame (I have wheel locks on my bike, but secondary protection is always welcomed). This version, while slightly lighter, offered more space to lock my bike to more choices, but I could also get a wheel locked up to ( and thus preventing a jack from getting into the lock). This became a win/win
Second. Storage. While not in use, i found it a pain to store the 'Fahgettaboutit'. When I carried a back pack with me, the extra weight was really noticeable and uncomfortable. I couldn't really keep it in the front of the bike. I tried keeping it on my rack in the back but i found it a little dangerous because the little shifts in movements become dangerous at high speeds, especially while turning. With this version, when I found out it has the bike clamp I became really excited. Not only does it store it safely, but I have it in the center part of my frame, which means my CG (center of gravity) is excellent. It doesn't move or shift at all. Every month or so it becomes a little sticky or doesn't slide in 'n out as easily and I just add, literally, a drop of oil and it's back to as good as new. The trade off is some folks like to keep their water bottle there. So if you don't mind the trade off or have another place for it ( not enough space for both inside the frame) consider this lock.
Lastly. Security. I started by saying that security was my number one most important option, and then I give all these reasons why I love this lock and none of them are security related. Well lets address that. Remember, all locks are merely deterrents and all can be cut through. All of them. You're never going to be 100% theft proof. Impossible. Yes the Fahgettaboutit is the Fort Knocks of locks. And if that's the case, then this is the....hmm, what's the 2nd most secure building ? No one ever talks about that! I digress, basically this lock isn't no push over. You're not getting through with bolt cutters or other little toy options. You need a cordless saw ( don't laugh, they use them!) So basically it comes down to this. This lock will take about a minute to saw through. The Fahgettabouit will buy you an extra maybe 10 to 20 secs of drill time. Will the cops show up or a citizen intervene in the extra time ? Chances are if it didn't happen in the first minute, its slim to happen in the next 20 secs. Is that extra drill time worth the trade offs of everything listed above. If it's for you, then the Fahgettaboutit is the perfect lock. For me, the trade-offs as mentioned above are more valuable in a day to day situation and I feel just as safe.
Hope this review helps.