In reply to Greenbanks:
I can see where you're coming from - it's surprisingly intimidating! I did like the two lines I did there, though (Fratricide Wall; Lavaredo)
I'd be keen to go back as there is clearly a lot more worthwhile climbing there, but the Rockfax and Ground-up only have 4 climbs shown and the CC guide is pretty hard to make out.
If there is a new edition of North Wales Climbs ever coming out with Rockfax I'd recommend giving Carreg Alltrem comprehensive coverage. It will only take an extra page and it would be worth it. You can even include my E2 direct finish of Fratricide Wall as an official grade