Have you checked the new is there any deal website?

Did yesterday, but back then it hadn't crawled Humble Store yet, so I only synchronised.

Yes but not for long. I'm disappointed to find all my filters have disappeared. It seems all the same functionality is there, and the ability to save them.

I'm trying to reserve judgement until I've gotten used to the layout, but, or example, I don't like the grid layout of a bundle page - I just want to see a list of the games included. The Waitlist view gives a toggle between grid/list and the Deals page is just a list. Seems a little inconsistent at the moment.

I used the "store" or "purchase" location to keep track of the games I have on different platforms, such as all the freebies on Indiegala or the ones I have on GX.games (Opera browser), etc.

You cannot filter your games by this field anymore, so you cannot get a list of all the games you own on each platform. Also, for the platforms/stores I added manually (not already in the default list of stores) it just removed them and instead put a "Type: GX.games" in the "Notes" field, which I assume means custom "stores" are no longer supported.

Their new site still is not able to import my Steam collection, so I will continue to not use it

Since gg.deals became popular I stopped using ITAD actively although I still use it indirectly with Augmented Steam.

Kinda sad new site doesn't have RSS, which was quite useful for tracking freebies and new bundles.
EDIT: thanks to comment above found good replacement for ITAD RSS feed: [link removed]