i got to check out the spurcycle at a LBS here and wow it is loud. it comes in really beautiful packaging. i was pretty impressed. i ended up going with the incredibell due to pricing tho, and so far i've been happy with it. today was my first real day using it (got it on Fri on my ride home, but have been using the family bike over the wknd instead of the commuter) - people definitely hear it above the construction (drilling and such) going on everywhere, so the piercing of it does work at getting everyone's attention which i needed. i was so tired of yelling bicycle behind you every 50 ft in a decently long stretch.