You will also want to look for a company that doesn't introduce low hanging brackets that will actually reduce your clearance.
Personally, I've run these brackets on my JK for going on five years now. While my JK spends the majority of its time on-road, the off-roading I do includes a fair amount of rock crawling on some of the more difficult trails in PA, VA, NC and SC.
On-road, these brackets have added some noticeable benefits: better front impact ride quality (i.e. expansion joints/cracks in the highways aren't nearly as jarring) and virtually no front-end dive when doing an emergency stop (i.e. nailing the brakes).
Off-road, these brackets have never posed any issues for me.
To your point, there is a loss in clearance where the lower control arms mount to the frame. The only way to reduce the angle of the control arms is to mount them lower than their stock position.
In the rock crawling that I do, the lack of clearance hasn't been an issue. it's unusual for me to get a tall rock that far back in the first place (with the front tires still flat on the ground). When it does happen, I just slowly slide across. I've never been stuck because of this, and I've never damaged a control arm because of this (and I'm still running stock control arms). From years of watching others wheel, seems like everyone occasionally runs into an situation where they don't have enough clearance under the control arms, using these brackets or not.
I guess my point is that these brackets add two positive handling features on-road, and the one negative (lack of clearance) hasn't caused me any issues. Therefore I'd not hesitate to recommend these brackets to most folks.