How well a guy can shoot from any of field rest is dependent upon the individual. I personally have no trouble taking 300yrd shots on woodchuck sized game with the Primos sticks, but I’ve been shooting from sticks for over 25yrs, and do ALL of my hunting from them. I usually use a revolver or specialty pistol on a monopod, so when I switch over to a rifle on a tripod, life is REALLY easy. I’ve taken coyotes at 500-600yrds with the Gen 2 trigger stick. Then again, we were shooting 8” targets at 370 and 10” circles off of barricades last wknd, on the clock, so my perspective of practical shooting might be skewed.
I can’t get comfortable with the Caldwell field rest. The original version had way too much flexion in the legs, and the new magnum version still has the same ungainly head piece. The new bog gear top isn’t as big, but I’ve just never been comfortable with a fixed front and rear rest. Not for me. If I need more stability than a primos or bog gear tripod offers, I’d rather go prone, shoot from the bed of my truck, or set up my portable tables. I do have a Feisol tripod with a hog saddle on a ball head - converting that all over to ACRA Swiss rails for now, then going to have an MPA rail in my newest Manners when it comes in...
I’ve used the 13-22” Harris’s for over 20yrs, can’t say I recommend them. It’s better than nothing, but they aren’t stiff enough to really get stable when fully extended, and the 27” really isn’t any different. I’m 5’10”, I have to sink down to the 22”, a 27” would probably be the right height for me, and you likely wouldn’t struggle getting low enough to get down to it, but again - it’s not stiff enough for the task.
So that’s a long answer to say - I wouldn’t struggle to hit woodchucks with the trigger sticks. Other folks might.
The huge advantage of the Primos trigger sticks is the deployment speed. Tie some paracord in a triangle around the top of the legs to give you a quick and even spread, then just pull the trigger to set height. Super fast, and stable enough compared to the rest of the field, they’re the only ones I care to use.