Rating very suspect. Instead of being useful for people who use Suno with intention (you write, mix, evaluate, or edit), this seems to be created _only_ for churning out slop: any feature that would be useful for such a user does not exist/work (even with an account and Kuytools' credits-- in fairness, the pricing on the credits works out to about US$0.01/credit, which actually makes the coercive design that much stranger: is it meant to mislead you that 1 credit = 1 generated song without a Suno account?).
I'm not in the slop business, so what would be useful..
For me, bulk download would be very helpful (a free feature): it sees 0 songs on the page. Including lyrics in a .txt would be great: has the feature, but sees 0 songs, so..
For me, managing song versions with extra info about gens (datetime, fingerprint, etc.), and keeping track of lyrics (like what version of words a song has): no. You can't even provide lyrics from the sidebar.
For me, creating style prompts that are more accurate, precise, and music-literate than mine-- since I am not a musician, help with the Style prompts would be useful, but only if it produced better results than my messing around. To test, I took a classic rock song (real world, very famous) and entered into Kuytools the name of the band (again, incredibly famous, particularly the vocalist). The extension said it found a match for the band as 100/100 (Cool! But it says it knows only 479 artists, which maybe explains why it returned an all-girl K-Pop band when checking for particular 1980s top-40 band from Australia). I already have the words, so I had it generate a 100/100 Style prompt. I tested the result many ways, always with my lyrics (phonetically; no © issue): style by itself raw, style by itself as a cover of a previous version, style with a Voice that is as close as I've gotten to the singer and no cover audio, style + cover + voice. You would not recognize what the band was supposed to be-- even with the lyrics. It sounds like a Suno-by-numbers karaoke version, that also mispronounces my phonetic lyrics (my phonetic lyrics have this problem very rarely, and this version has already been well-fixed for those errors).
For me, downloading WAV instead of MP3: yes, if you have a Suno Pro account (it's Suno's limitation, though I have Pro). The wording in the extension just says "requires Pro account" which is not clear that you need credits AND a Suno Pro account.
Even "free", it wants you to create an account-- and the extension says you must log in to your account if you want to use your _own_ LLM API keys. Except it says that even if you are logged in, and there is no place in the extension or on the website to configure any such other keys.
If only it had any useful features that worked as well as the banner that keeps popping out to remind you you're running low on (their) credits the moment you have an account.