dont know if its a wivestell or not. ive done 3 guild resets , not really any harder. They do use a different glue, that seems to take a bit longer to heat and release ,but i havent encountered any extremely difficult ones
From what era(s) were the reset jobs? Hide glue was the glue in Westerly at least, and as far as I've seen credibly reported, they started using Titebond on necks in New Hartford ('10-14).
Anyway, re "special glue", noted luthier Flip Scipio worked at Westerly in the early-mid '80's IRCC and described the glue pot as being basically continuously topped up without any regular cleanings, to the point the glue even became contaminated with metal shavings.
THAT certainly may have been a contributing factor in breaking loose at least some necks....
But otherwise think the majority of reports here reflect your experience. The "hard to reset" thing does seem to be a myth based on extreme cases.
Also, they finished over the neck joint, so that's quite likely to require NCL finish touch-up for a "complete" job.
Br1ck mentioned the flat heel and that has been shown to be a legitimate point of concern re potential splitting under compression by our member CristopherCozad who also is a luthier.
Home page of Cozad Guitars. Luthier Christopher Cozad builds and plays handcrafted acoustic guitars.
cozadguitars.com
Couple of Guild reset photoessays there.