Chesstempo first attempt - is it worth the membership?

I'm trying out chesstempo for the first time! The paid membership is roughly 30 Euros so I'm testing out the basic tactics features to check the quality and

ChessTempo Mixed-Mode Performance Analysis

Why everyone suggest chesstempo for tactics?! Are the chess. com or lichess much worse? : r/chess

ChessTempo Manual, PDF, Icon (Computing)

Mississippi State Chess Club

Why everyone suggest chesstempo for tactics?! Are the chess. com or lichess much worse? : r/chess

IJERPH, Free Full-Text

Gilgamath

How to make the most out of Chesstempo's premium membership? : r/chess

Opening training

Chess tempo - Train chess tact - Apps on Google Play

ChessTempo Mixed-Mode Performance Analysis

Musings on Chess Openings - SimonM's Newsletter

Should a chess player reach a certain level of proficiency before developing a 'style?' - Quora