I've tried the Adam's, along with practically every leather conditioner out there. I wasn't impressed.
The Four Star conditioner is very good. Zaino's is good but has a very strong leather scent, which will get on your hands and make you smell like a boot for hours. I used the
Sonus the last time I did my interior and liked the effect, but not the smell. It is a very high-quality one. Griot's also makes an excellent conditioner. Any of these would be a good choice, depending on what you are looking for.
For a cleaner, I second the Woolite recommendation. That's what many car manufacturers recommend, and it works very well without leaving gunk behind or making a stain worse.