I've been playing for a few years now and have been lucky enough to be part of the Patron D&D group as well. I figured I'd give some thoughts on D&D Beyond if people are looking at that for an easy way to manage everything D&D wise as I recently bought into the ecosystem...
The short version is that, if you already own the Player's Handbook and maybe some other books as well, then it may not be completely worth it. I say this because, while it is free to create your account and use things like the character creator, you have to also buy the associated books to "unlock" certain content. For example, if you're wanting to create a warlock, you can only choose the pact of the fiend without paying for the player's handbook which unlocks the other pact options. The same goes for books like Xanathar's Guide to Everything which will then unlock the other options there such as Hexblade.
The books on average are about $30 each, however the nice thing is that you can actually buy just parts of the books if you don't need everything. For example, I wanted a complete list of the demons so that my nifty new Summon Greater Demon spell could have some good options, so I was able to buy just the creatures from one of the campaign books for around $7-8 instead of the full $30 for a campaign that we won't ever play. Depending on how much you want to rely on digital toolsets instead of hard copy books and pen/paper character sheets, it still may or may not be worth it.
My favorite part of this is by far the character creation aspect. Once you choose your race and class (which gives you the book-text descriptions of everything including racial bonuses), the layout for choosing each new feature per level is great. If there is a static feature such as gaining extra attack, it will simply describe it exactly as the book does. If there is a choice to be made such as class feature or ability score increase, it will alert you and present the choice very clearly. For my in-person game, we started out at level 10, so it was very quick and easy to make the choices I needed to make and have it create the character sheet for me with everything calculated out.
After your character is created, you can really go about using it either in D&D Beyond which allows you to keep track of health, spell slots, limited use skills, etc. or you can simply export your character sheet into a PDF and print it off in the exact layout as a standard character sheet. I used the digital version to track my last game where my barbarian was basically being attacked by a whole town and the party (don't drink literal snake oil, trust me), and it was decent but required a lot of shifting around in the digital view to get to what I needed. However, being able to look at certain features and have the relevant description right there instead of writing it down onto a character sheet and then having to look that up in the physical book was pretty nice.
Those are my initial impressions with it, if anyone has any questions for me about Beyond or even how Patron D&D works, I'd be happy to answer.