Strobes are small and can significantly aid in recovery.

I personally do not see a minus other than weight, and that is not very much.

I carry the ACR Military Distress Marker Strobe, I can get them in my area for around $20-30. They run on AA batteries, and they do not weigh much (about 5 ounces), a little bulky for a pocket kit. They are bright, easy to use and very reliable.