They were cheaper fitted the tyres ok but made a complete pigs ear of the balancing, I suspect having a balancing machine in a van being bounced around in the back is not the best thing to do to it accuracy..
The fitter was spot on and even waited while I painted his shiny silver balance weights before he put them on my black wheels. Apparently they normally have black weights with them but were out of stock.
They were careful with my rims and the balancing on mine was fine so would have no hesitation in recommending them.
No idea about Event Tyres, used them a few years ago as well, also with no issues. Their website is down though so there could be a problem?