A Classic 1.10 Expert Pack

It's a classic expert pack from an older era when expert packs were becoming the norm (Infinity Expert and Ozone 2 had only come out a while before this). The mod choice in the early and mid-game is unique, especially with Calculator which I haven't seen used much anywhere else.

The only issues are that the tedium can be a lot both early on, and after you set up UU matter replication. All of my runs stopped after that. In fact, I heard that the tedium continues to increase, thus my 4 starts for the gameplay. And that's AFTER I manually added Ore Excavator/Vein Miner to the modpack. I have no shame in doing so, it brought me more fun where it mattered.

Otherwise, there's plenty of clever setups you can make using the mods available (Calculator, Actually Additions, Tinkers 2, Super Circuit Maker, Extra Utilities 2, etc.) These clever setups and inter-mod compatibility is what really defines expert modpacks imo.

Also, stability is so-so, but that's because it's on Minecraft 1.10 than because of the mods themselves.