sound as a pound
Welsh valleys slang, believed to either have originated from, or given rise to, the 'can of lager/alcopop for £1 until 7pm' promotion that Merthyr's former premier nitespot The Zone used to run.  Now means much the same as sound and safe in the complimentary 'cool' sense, expressing one's admiration for another individual/thing.
'That guy's sound as a pound, mun'