So I played a game with Gambler and Terrace - Gambler didn't work out for me, but I got it too late, and Terrace was fun to choose when to use the power.
I also did an Enterprise/Progress game with Clerk, Jubilee, Floodgates, Refurbish, Vendor, Fund, and Superstitious Village, Innovator, Congress, Caravel.
I erroneously bought a village early in the game even though there was no terminal draw in the kingdom, but I eventually got a Clerk / Vendor engine going with Innovator as the payload. I ended up winning by a point despite my mistake by using Floodgates to save up an innovator and a Fund up for a double province at the end after many turns of PPR. In retrospect, a simple BM+ Fund+Innovator probably would have best, but I was tempted by all the new cards.
I like Clerk a lot better than I expecting to, and I think it could definitely cost $3 instead. You already have two other $2 cards, and Clerk is useful in almost all kingdoms with weak trashing, it seems. Jubilee wasn't useful here because we didn't need actions, so I can't comment on it. My opponent got Refurbish, but it nombod with Clerk and Vendor, so it although it seems pretty powerful at $3, I think that's a reasonable cost. Fund and Floodgates were really fun - floodgate is a keeper for sure. Vendor feels really similar to Spice Merchant, especially at the same cost. It was fun, but kind of confusing.