I tried the high energy lamb Burns on a recommendation a good while back, about when I first got Rodaidh and both he and Alfie lost a heap of weight very quickly and their coats were awful so I took them off it again pronto and haven't used Burns since; apart from anything else I think it's very bland food and they didn't like eating it, even Tilly who is a gannet wasn't keen.
My lot are currently on Barking Heads lamb variety (all natural, high quality ingredients, no cheap fillers like beet, British made, no additives, no chemicals etc.), it's a good food and they like it but I've managed to get a local stockist for Healthy Paws who gave me some more samples of it last week which they all wolfed down, even picky Rodaidh. It was about the most enthusiastic I've ever seen Ro with a dry food so they'll be going onto it once they've used up the Barking Heads; I also like the idea of rabbit being the protein source in the food (just personal preference!).
Interestingly I spoke to Robbie Burns at the SKC show a few weeks ago as he had a stand there with his foods and he does not share his brother's view that allergies to beet pulp are rare
This really depends on who you speak to and what sources you read, it's a bit of a minefield really but personally I think it could be behind some skin and ear problems in my lot which is why I'm no longer going to use foods which contain it.
