We went today and it was great. Much cleaner, and less chav-tastic than Flamingoland; no litter or smoking; and far less bare flesh, midriffs, and tattoes on show .. but then it was a cold, wet, windy October day rather than summer
Anyway, it was not too huge - you can get round it in a day; nice balance of rides, and none of the queues were too long; and the staff all seemed very H&S conscious.
And very SEN-friendly. My db is in a wheelchair, and we had good access virtually everywhere. And he got in half-price, plus two "pushers" got in half-price too.