The “Pessoa contraption” is pretty prevalent among fei show jumpers. That said I worked for a rider for a long time who grew up riding with Necco and we never used the Pessoa system. I’m not a huge fan personally and it can really go wrong if horse and lunger are not in sync. I have seen people flip horses over and seen horses run backwards through fences. Of course this happens without the rig on but it just seems to me there is less room for error or miscommunication with it.
I am a big fan of longlining.
I am not a huge fan of either chambon or sidereins although I have used both extensively. I like to be able to release when the horse “submits” and find that neither of these tools really allow for that and I see a lot of horses developing incorrect musculature.