Feather on a string 7 +s = simple to make, easy to use, cheap, light to carry. -s = no wind no movement, easily lost or misplaced
Whirling Woodpecker 9 +s = great motion, easy to use, light to carry, well made, can be placed low to the ground or as high as you can reach for better view for predators. -s = can be hard on batteries--I usually go through 2 fully charged rechargable batteries on a full day of calling, can't be turned on and off with a remote--stays running the whole time on the stand eating up battery.
Expedialite Woodpecker 8 +s = great motion, can use with one or two wings, light to carry, can be place low or high depending on terrain. -s = bigger than whirling woodpecker, uses more batteries than whirling woodpecker, can't be turned on and off with remote--stays running eating up more batteries than whirling woodpecker.
Jack in the box 6 +s = can be turned on and off with remote when connected to FoxPro, great motion--two speeds, has its own call built in, has a light built in to light up decoy at night--help to actually find it when walking out at night to pick it up after you are done with that set, easy on batteries--still using the 4 C batteries from last year. -s = big & takes up a lot of space in pack, sits low to the ground--predators can't see it with a lot of low shrubs around it from a distance.
Mojo Critter 1 +s = great motion, easy to use, light to carry, good customer service when you send it back which you will -s = poorly made, doesn't work when you want it too--most of the time doesn't work right out of the package, don't know about battery life only got to use mine once before it quit working and the next one they sent didn't work right out of the package.
Mojo Hawk 4 +s = can be seen easily for a great distance, rechargable battery built in, well made and durable. -s = too large to carry to every set, takes about 3 - 4 minutes to set up--putting wings on, pushing stake into ground, putting extension stake on, putting hawk on the stake, did I mention its size--too big to carry to every stand!!!!
These are the ones I have used and these are all my personal experience with them. Take it for what you want.