A lot of use them. It really just depends on where and how we are fishing. I have a few different anchors.
Mushroom Anchor - This is the heaviest of the 3 anchors that I have and by far the bulkiest. Its fine if you have room in your Kayak and works well when I'm using it on lakes and ponds. If I were purchasing a new anchor I would probably not purchase this one again for my kayak.
Grapple Anchor - This is probably one of your best choices as they can be found in pretty light weights and you can buy little kits like the one below that you can tuck away easily in your kayak. This is probably my second favorite anchor and certainly a good one if you are fighting current that the grapples will need to really dig in and hold you in place.
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NOTICE:</strong> If you're using one of these anchors I highly recommend using it on an anchor trolley with a quick release cleat. You want to be able to ditch it quickly if you need to.
Sash Weight - This is probably my favorite anchor to use right now. chip (AKA: Treehugger) found a good deal on these on ebay and hooked me up. The great thing about these is that they fit perfectly into your flush mount rod holders so they tuck out of the way easily. They work great in low current.
With all of these, I recommend an anchor trolly and a quick release cleat. You can but one of these foam floats to attach to your anchor line so that if you do have to ditch the anchor you can come back to it.
Here is an article about
anchor trolley's if you're curious as to what they are and how they work.