Regarding Double Talk, many of us have seen the finale, and I thought Henry Polic II was more polished. I'm confused why they changed it to Celebrity Double Talk, because the show didn't really change much and still had contestants. I think the only rule change they made later in the run was that the team only had to get 3 out of 4 to get the bonus points instead of all 4.
Shop Till You Drop was goofy, but honestly towards the end, I couldn't stand Dee Baker... I thought he was a little too over the top... great voice actor, great as Olmec, but overbearing in STYD. Still, I do agree that the Costco format was like when BTB 85 took away the stunts... it was just a dull show. I liked the second announcer/sidekick best, Jason Smith. Mark L Walberg, the show's first announcer/sidekick was okay, but I think Mark was better destined to be a host, but it wasn't until Russian Roulette came along that format and host clicked. I also liked On the Cover. I read that Mark auditioned to be the host of STYD but he was told he was too young. Randy West told me he auditioned to be the show's announcer/sidekick as well.
I'll add that Quicksilver had a good premise, but the presentation was a bit lackluster. It didn't help that the show also had a bad title. I read that the producers couldn't think of a better title for the show. Ron Maestri was... adequate. I think with some tweaks, and more money put into it, it could've had a stronger presence.