"Used loads of these and had a couple fail. Just very slight weeps which over time dribbled down the plaster and caused me a bit of a headache. The replacements work fine though so must have been something wrong with the internal O-ring. The simplicity of use do make these so easy to change though."
"The principal reason for buying the FloPlast Flo-Fit fittings was to save space in a tight area. Up to now I've used the JG Speefit fittings with great success (earliest use about 2 years ago and no problems to date), but they are relatively bulky. This is not usually a problem, but they are awkward in a tight space, particularly if you need to get your hand in to do/undo the threaded locking collar. The Flo-Fit fittings are significantly slimmer and shorter, and do not require a threaded locking collar to be screwed/unscrewed. Instead they use a self-contained clip. One disadvantage of Flo-Fit is that they require a significantly longer section of pipe to be inserted (33mm in total), so can be a bit more awkward to take apart for any future change or system maintenance. I cannot comment on reliability as I've only just fitted one."
"Save yourself some money and buy the more expensive speedfit fittings. I've bought these as singles and as a pack from screwfix, not screwfix's fault but i have had at least two faulty elbows that have later caused damage to customers property because of a faulty plastic casting on the main elbow body. Replaced both faulty items with speedfit fittings and they worked straight away. Proceed with extreme caution if you plan on putting these under a floor - ie don't do it - use Speedfit or Hep 2o instead. The coloured ring collets are a good idea though."