Since there's not a "Ridge Cut Potato Chips" section in the User reviews section, I felt that the IMO Community section was the most apt (although the Networking and Internet forum just lost out).
Ever since my young crisp eating days i've admired McCoys crisps. They capture something that Walkers and Golden Wonder don't.
The freshly opened bag in all its shiny glory.
The first bag i pulled out of the...uh bag is:
SALT AND MALT VINEGAR!!!!
w00t!
This is my personal favourite. The SnMV (for short) has an extreme hardcore tangy edge only rivalled by the Walkers MAXX range (which are too hard, and theres always 5h1t3 at the bottom - badly thought out batter). The thickness is beauuuuutiful. I cant believe the thickness of these crisps. they must be...uh 2mm! wow pingalingy! They are without a doubt the king of the crisp - matching the McCoys renowned thickness with the most vivid SnMV flavouring on the planet.
The next bag is:

CHEESE AND ONION!!!
funked! Get down!
Cheese+Onion = Cheese and Onion. Erotic. Admittedly I'm not really a Cheese and onion fan, that was always my sister's favourite. But CnO guru or no CnO guru, I am quite pleased with these crisps. Where they would never win in a head 2 head with SnMV, they certainly appease the consumer when there is nothing but your mum's dieting products (such as the dire "Go Ahead!" range). In short, delightful, but not much in comparison with the big guns (SnMV).
the final Bag is

Flame Grilled Steak!
Beans on toast? Possibly but don't quote me on that...
Frame Grilled steak is more of an American flavour and has never really captured the imagination of the Scottish public (always being the last bag in each uh...bag in every household i've been into - all three of em). Theres a reason. When times were hard, the scots would find cheese from a cheeseplant and consume it with a raw onion, and if times were really hard they would mix salt and vinegar into a pot and drink it as an alternative to Coca Cola (bare in mind this is the late 1640's we're talking about, there was no Pepsi or Irn Bru around back then). Whereas the ever resourceful americans would put flame grills and capture the wild steak bird and eat those put together.
Where's the handlebars on this harley davidson? It's goin in the wrong direction.
In short, flamegrilled steak smells like not nice stuff and doesn't rate as highly as the other two.
I would highly recommend a healthy dosage of SnMV flavour McCoys because they are the dog's...