Many owners of keel boats have reservations about drying on legs. Our Sadler 34 is the shallow keel version, its relatively long length making drying less of a problem than it might be with a deeper keeled boat. We had lots of experience of drying against walls with this and our previous boats, so the idea of buying legs held no particular fears for us. Something like 11 years ago we bought them and fitted them ourselves with little difficulty.
We have never regretted buying them and have had no problems whatsoever. We have dried between tides many times, this harbour being in one of the islands off south Brittany. Although it is an advantage to know beforehand that the bottom is perfectly level, having the adjustable length type can compensate for any unforseen lumps and bumps. One leg can be used when drying alongside to ensure that the boat does not fall outwards.
We have overwintered on them, with no other supports. They make antifouling easier, as all the supports are above the underwater surface. On one occasion, one for the confessional, we used them briefly when we ran firmly aground on a falling tide, keeping us upright until the flood arrived.
All in all, an excellent investment and one that should hold no fears for owners of keelboats.