If they are there for a week they will definitely want to go with the neoprene stocking foot waders plus separate boots. Simms are excellent and what I use today. I had redingtons for a few years that worked just fine and were cheaper but not as good (and didn’t last as long). If I bought waders today I’d buy Patagonia because they are the only brand I know of with a lifetime guarantee (all waders will leak eventually).
Yeah Patagonia’s return policy is great but that doesn’t help you when your 3 days into a week long trip in the middle of nowhere, or when you have to send your stuff in again midseason and your without your gear during prime time. I bought Patagonia’s highest end pair of waders a few years ago, within 10 days of medium use they were leaking in crotch and booties. Same can be said for one of their high end ski shells I purchased. They have gone so far to the extreme with being “green” that their quality has suffered greatly IMO. I continue to use the stuff I have, but refuse to buy their stuff anymore after multiple failures of top end “Pataguchi” gear.