the evo mini is awesome for making quick stops and whatnot. i like it much better than a chain+padlock for work, just in some situations i'm forced to be a little creative with locking up. it's obviously lighter, doesn't interfere with my bag when it's stuffed and doesn't hurt like a mother****er if hit the ground. - it's fine to just lock the toptube or sheldon brown the rear wheel if you don't have qr skewers and are leaving the bike alone for like an hour max (if i expect to take a while inside a place with windows, i just lock in my line of sight), but if you're planning on regularly locking up for a lot longer, go for a chain.