The feedback from [ local ] riders who actually RIDE on the polytrack, is inconsistent. However one opinion that seems to be almost universal - I say almost because there will be one who disagrees - is that the surface is vastly better after rain. That does indicate that irrigation would probably be a good idea, especially in the very hot, dry summers we regularly experience in Canterbury.
A visiting girl, here for a few weeks recently, said that riding on her home track [ Cambridge ] was like riding on a cloud. Not so initially but very nice now. Not so here. I don't have any info as to management differences, but can only report her comments.
Two riders, from England/Ireland, both think there is inadequate top compared to the tracks they are used to. Again, only reporting comments, so don't shoot the messenger!
Some trainers want the going firmer, others want it loose/fluffy. Must be a nightmare for the track manager trying to keep everyone mollified. My own opinion, is that there has to be an optimum preparation regime which managers should be adhering to, as best they can, without interference.
Another observation - this from an experienced traveller/rider/strapper, all over the world - is that a firmer, packed surface is actually safer for the horse. The composite material, when tightened up, protects the horse from the tarmac layer underneath. When ' fluffy' and loose, as some want it, the horse has less protection and can cut through closer to the base. Concussion from the base is a real risk then.
Jim's query, about running/walking on the track, I can answer; I find even walking very difficult, and my reconstructed ankle doesn't like it at all. Far more comfortable to walk on the nearby ambulance track, which is firm and level. My dogs, when taken for a spin, will only cross it to get to more interesting areas in the middle. The greyhound, who is mostly on the lead, hates it.
An acquaintance, who is a very fit soul and runs k's daily, tried it out and won't again. Reckoned it was awful to run on.