These seem like a high end tool for expert and beyond. I'm leaning in treading carefully so it doesn't feel like work. That may seem weird to the most passionate of players but I am expert level in my other hobby and it feels like work and why I'm going back to chess. That being said... I'll work hard at it as long as it maintains a level of "fun" as well.
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With ChessBase the software will build your opening tree in 2-3 years. Without ChessBase it will take you 8-10 years to build your opening tree by hand.
Iknow I built an opening tree by hand, I took me 8 years.
All you have to do is enjoy playing over old classic chess games. That's it.