I bought this as a spare, so it has only had occasional light use. There is plenty of adjustment so that it should fit securely on any 4/4 size violin (may also fit a 3/4 size violin, but I've not tested).
The rest is lightweight, and I find it comfortable. The "feet" that grip onto the violin are soft enough to avoid the risk of damaging the edges, and when properly adjusted will hold the rest securely in place.
Build quality looks "inexpensive", but no problems so far, and pretty good quality for the £30 price tag. With the feet folded down it fits easily in my violin case.