I’m not super familiar with the other two names you mentioned, but know several folks who have sent horses to Dodon with varying degrees of success.
One mare just needed a tune up really, which I guess she got. One gelding was having a few “Oh I’m so fit now, must be naughty” problems and was sent down to finish out his jumping education and a bit of boot camp. Both were OTTBs which Dodon specializes in, though to be honest after reading some of their correspondences I would not have guessed that.
My friend with the gelding I think would not send another to Dodon given the chance (and the mare was sent to another, somewhat closer farm the next winter). My friend really felt at the time that Dodon’s communication was lackluster at best, and felt that she had been led to believe on more than one occasion she would be receiving an update (call or email) by a certain point and had to chase them to get updates even on just the horses’ general condition. The farm claimed that the horse took a while to “settle in” (wasn’t ridden for nearly 3 weeks upon arrival), and though was sent to them happily bopping around some gymnastic lines ready to be introduced to courses, he was there for 4 months before any evidence of him running through even a 2’3" course. When he came back he spent some time with a local trainer and everyone agreed that he was telling us he was mentally and physically ready for more challenging questions (the reason he was sent to Dodon in the first place- he HAD the foundation). He WAS a hot TB with “personality”, but not dangerous or unsafe in any way, but sensitive and requiring a specific ride. Friend was disappointed with the whole experience, and while not thrilled with the communication skills she did said she was never concerned that the horse was being mistreated or neglected in any way- but darn wouldn’t it be nice to have a phone call “how’s my horse 1500 miles away doing?” returned in less than a week 