Installed some on a few baits back at the beginning of the season to see how they did. I did it for two reasons, one being I joined the 'treble through the thumb club' in August '16 and secondly I wanted baits to come through grass/weeds cleaner. I had the usual doubts about hookups and missed fish, but I went through with it anyhow. I fish for fun, no money on the line or anything like that so I had nothing to lose. I did some lipless cranks, blade baits and some minnow type hardbaits. Didn't do any jerkbaits because A) I suck at them and B) It would ruin the balance ...
The season is winding down and I've decided I'm staying with them. I honestly didn't see any noticeable difference in hookups or lost fish. Face it, there's days when they'll just about crawl into the boat to get your bait and there's days they just swat at it or don't want anything at all to do with it. I will concede that there are times when a sticky sharp treble may snag an otherwise uninterested fish that bumps the bait and an inline hook won't help you there, but overall I just didn't see a big difference. It definitely helps baits come through vegetation a little better - not 100% snag free but noticeably better.
If you were thinking about it I'd say give it a shot. I don't see myself going completely away from trebles, but these definitely have their place.
Notice in the pics that the majority of the time they ate the head first, that's why I face the front hook forward. Facing it back may make it more weedless but you'd probably miss a lot more fish.