Customer Rating: 
Summary: they work great!
Comment: I added two of the weights to the housing for the sd700 and the camera was a little negatively bouyant, which is my preference. I've seen a few complaints that the screw loosens while using so I decided to try something that worked great. Take a small peice of plumbers tape and wrap the screw 2 or 3 times before tightening it up. I used the camera like this for 5 days of diving and never once had to tighten the screw.
Customer Rating:
Summary: Heavy Man
Comment: What more can you say other than they are made of metal and they weigh stuff down. Required only one of the 4 included weights to make my WP-DC5 for my SD700 neutrally buoyant. Does exactly what it's supposed to.
Screw the weight in tight and tighten with a coin or something, this probably could work itself loose over time, but as long as you check it after each dive I doubt it could come completely loose that quick.
Customer Rating:
Summary: Good but not if you use an external strobe
Comment: These are great but not really feasible if you plan on using an external strobe with your u/w housing and weights (at least with my Canon and Sealife Strobe). I still haven't found the right solution yet. But without the strobe, they work great.
Customer Rating:
Summary: Canon Camera Weights
Comment: Weights did the job but did not need but two of the four weights. Thumb screw that hold weights in place tends to work loose. Needs lock washer.
Customer Rating:
Summary: Looser as you dive
Comment: The weights worked wonderfully but there were three things I'd like to point out before singing it's praises.
1.) As I was diving with the camera, the weights eventually worked themselves loose and had to be tightened about every 2 dives.
2.) The main screw that holds the weights together and on the camera (and that kept working its way loose) was the part that rusted, despite regularly soaking it in fresh water and drying it after diving.
3.) I met at least 4 other people with a canon underwater housing and only one other had weights for their camera. Everyone else said they didn't really need them. As for the two of us that had the weights, we only used two from that pack of 4 and the weighted case bumped off of stuff because it was dangling below, rather than hovering with me.
Summary: they work great!
Comment: I added two of the weights to the housing for the sd700 and the camera was a little negatively bouyant, which is my preference. I've seen a few complaints that the screw loosens while using so I decided to try something that worked great. Take a small peice of plumbers tape and wrap the screw 2 or 3 times before tightening it up. I used the camera like this for 5 days of diving and never once had to tighten the screw.
Customer Rating:
Summary: Heavy Man
Comment: What more can you say other than they are made of metal and they weigh stuff down. Required only one of the 4 included weights to make my WP-DC5 for my SD700 neutrally buoyant. Does exactly what it's supposed to.
Screw the weight in tight and tighten with a coin or something, this probably could work itself loose over time, but as long as you check it after each dive I doubt it could come completely loose that quick.
Customer Rating:
Summary: Good but not if you use an external strobe
Comment: These are great but not really feasible if you plan on using an external strobe with your u/w housing and weights (at least with my Canon and Sealife Strobe). I still haven't found the right solution yet. But without the strobe, they work great.
Customer Rating:
Summary: Canon Camera Weights
Comment: Weights did the job but did not need but two of the four weights. Thumb screw that hold weights in place tends to work loose. Needs lock washer.
Customer Rating:
Summary: Looser as you dive
Comment: The weights worked wonderfully but there were three things I'd like to point out before singing it's praises.
1.) As I was diving with the camera, the weights eventually worked themselves loose and had to be tightened about every 2 dives.
2.) The main screw that holds the weights together and on the camera (and that kept working its way loose) was the part that rusted, despite regularly soaking it in fresh water and drying it after diving.
3.) I met at least 4 other people with a canon underwater housing and only one other had weights for their camera. Everyone else said they didn't really need them. As for the two of us that had the weights, we only used two from that pack of 4 and the weighted case bumped off of stuff because it was dangling below, rather than hovering with me.