I tried out Indigo (a new client app that merges Bluesky and Mastodon into one feed). First stumbling block was getting signed in on the Bluesky side - I've moved my data to Eurosky, and needed to open the custom option to set that as my server.
It looks nice! But, I'm not currently planning to subscribe in order to post - I have a range of other apps that let me post. It seems like an interesting idea, I wish them well! For iOS users who straddle open social networks, it might be worth a look.