It sounds like most of the people on the forum growing in S/H are growing plants inside, and the main reason for going to S/H is to facilitate watering. Are there people out there growing in green house conditions that have placed some of there collection in LECA under S/H conditions?
I have switched about 1/2 my plants to S/H (50). Most are Cats, Dendrobs & Encyclias. The only problem so far was repotting when I wanted to rather than when the plants were ready based on S/H protocol. Some bad timing resulted in a years lag in growth and several casualties. First Year - The Cats initially repotted in LECA (Hydroton and PrimeAgri) and clay orchid pots sitting in individual shallow plastic pans are doing spectacular so far as new roots and new growth. In fact if there are problem(s) brewing it is an embarrassment of new leads that are out of control i.e. making training difficult ans later repotting a night mare, and prolific root growth that may soon over run the pot and cause a reduction in air exchange just do to the increased root mass alone. There appears to be a build up of salt residues, but so far no sign of it affecting the roots. The other 25% of the collection went into LECA and plastic S/H pots some time afterwards. The verdict is still out on them. Some slow starters, but again it might be just bad timing.
One lesson learned the hard way; follow root length protocol.