First off, I wanted to point out that I have used Google, the search bar, and also read plenty of threads, however, I still can't decide on which new lock to get. I DO have the Kryptonite Fahgettaboudit Mini U-Lock, but at times the weight and size makes it a hassle to carry. I currently have my sights set on either the OnGuard Bulldog Mini DT or the Kryptonite Evo Mini 5 or any other mini u-lock similar in size and weight. Yes, I know there are tons of threads out there comparing the two, but I have yet to find a single thread answering all my questions (I hope this thread will do so, and also help inform others who are wondering). I do plan on using the lock for daily use and at times, maybe locking more than an hour or two. Before I proceed any further, the price between the two doesn't matter, I rather have peace of mind compared to saving a couple of bucks and being bike-less. Just also want to point out that I currently live in the city of Philadelphia, PA...good ole brotherly love...haha...

Double Bolt or Single Bolt? Looking at the Onguard Bulldog Mini DT, which consist of double bolt locking, this would mean that the shackle would have to be cut twice in order to steal the bike. On the other hand, Kryp. Evo Mini uses a single bolt locking which isn't as effective and supposedly can be defeated in 95 seconds?(http://www.bikeforums.net/archive/in.../t-101597.html) However, some thieves might move onto another target if its going to take enough force where the frame or wheels becomes mangled to steal the bike...

Multiple Keys? I have read in numerous different threads, each claiming that "person A key" can open "person B lock" for BOTH the Onguard and Kryptonite locks. After more Google-ing, I had also came across threads where individuals claim that Onguard only uses about 10 unique keys, while others claim that Kryptonite suffers from this problem. Another problem which arises, is the popularity of the lock, where as being in the city, I can spot more Kryptonite Evo Mini users vs Onguard Bulldog mini. So if Kryptonite DOES use more unique keys, it is still such a popular lock that even if its 1 out of 30 keys, there could be 300 locks with 3 of those keys matching. Has anybody ever truly came across this problem for either one of the locks?

Quality? I have honestly read about more users posting that their Onguard lock jammed up while locking or that the key some how broke in the lock. This is a HUGE issue for me, as well as it should be for any other bicyclist, because a lock is useless if you can't unlock it...or even worst if the bike was locked then the lock jams......But I did notice that most of these post about the Onguard lock jamming was in 2005 or 2008, which makes me wonder if this problem was fixed within these couple of years. I know that some people claim using lube on the lock helps it lock better and trying not to leave the lock out in harsh weather does some justice as well. Has anybody experience these problems lately? Preferably with locks bought within this year? On a side note, I did see one poster saying "try to not drop the lock as much", which is quite interesting because if the lock jams up on a couple of drops, I wonder how it would last against thieves attacking it...

Size? It is known that the Evo Mini is small, but I'm wondering how many locking options are there with various poles, bike racks and whatnot. Maybe someone in Philly is reading this and could give good insight? On the other hand, I have read that the Bulldog mini is slightly wider giving the user more options of locking capability.

Finally I would like to apologize if the post was too long to read, I was just trying to be as clear as possible. And before anybody says it, I am not getting a dog and tying it to my bike

Thank you for taking time out of your life to read this very long post, and thank you for any replies.