Well, I finally upgraded to Horizons and I'm on the fence on whether or not it's worth it. I'm not talking worth it in $, I'm talking about worth it in gameplay. I've landed on a few planets, spent a lot of time driving around looking for certain rocks (and coming across mining sites, crashed probes, etc). I've also spent a few hours scanning ship wakes as well as hunting down wanted ships to collect the pieces that drop, also for engineer upgrades because really, that's what Horizons is all about.
And I have to say, it's kind of "Meh". At least in the base game, you can make a few jumps and trade, or bounty hunt, or do some missions and in 15 minutes you make some progress, get some reward. I drive around on a planet for an hour, or wake scan for an hour, or BH for parts for an hour, and I don't find what I'm actually after. In fact, after about 8 hours of this kind of effort, I found 2 rocks, 1 scan, and no parts for an FSD upgrade I'm after.
Now I'm not saying after 8 hours I had absolutely nothing but 2 rocks and a scan, I did pick up lots of rocks, lots of scans, and lots of parts, and they will probably be useful for something, but I'll have to fly to all of the engineers and look at all of the blueprint options to determine what's what.... and I haven't even started on the commodity stuff, or whatever requirements each engineer has just to say hello.....
So yeah, I'm not too impressed at the moment at the time vs reward ratio. And although planetary driving watching the wave scanner is a new twist, after an hour the novelty kind of wears off. I sure hope the RNGupgrades are spectacular!