I always had terrible luck with the decoys I used. I've had several of various brands and poses, jake and hens, etc. I never spent more than $50 and they looked it.
After seeing several successful hunts in person using the 1/4 strut jake, I decided to buy one. I have the Best Turkey Decoy. WHile I wasn't sure about having a $100 decoy, I have had great success every time I've had the chance. I've shot several birds at less than 10yds with my bow.
I just returned from Nebraska and my daughter had 4 shot opportunities in 3 days. The few times that the birds did not attack the jake decoy, they hung out in the area. My buddy Dan bought his own decoy and had 3 toms beat the snot out of his decoy. After he shot his bird with his bow, the two toms atacked their dead buddy and then strutted around the jake. Why? Who knows, but it didn't spook the birds.
If you're gonna bother with decoys, get as realistic as possible.