Something that composband does really very well is that it fixes what just put me away from vanilla angband : early dungeon crawling.
As i said before, even in the latest version i find vanilla angband dungeon to be very boring because it's extremely huge and nothing really interesting is in there.
vanilla angband for me start to become interesting +/- after i get over level 20 , because in floors i go at that kind of levels interesting stuff start to happen with enemies that become challenging instead of just being barely noticable when you move through them, and by then my character has now many options and floor exploring become more focused because i need to know when to pick my fights, when to retreat temporarly or urgently , there's more tension and so the game start to open in the actual fun.
But before reaching that point, it's just unfortunately a long boring time for me.
Composband avoid that by a simple but actually genius idea : until you reach the 30th floor of a dungeon, the floors generated are small.
And because they are small you spend a lot less time using the run button (shift+an arrow key direction) ,you have more chance to actually fight something instead of feeling you're just wasting time exploring giant corridors of nothing leading into nearly empty rooms.
And when you reach the 30th floor of a dungeon, it is additionally when you reach the point in which i previously mentionned that i only started to have fun in vanilla angband. And so the floors starting to get bigger does actually add to the tactics as there's more location to find stuff , more area to retreat/teleport away, more zones to get in trouble etc...
Additionally there's a lot of variety in the dungeon , because you have actually multiple ones with their theme and own terrain that add the diversity you don't really find in vanilla angband.
So yeah, if you want to play angband, i strongly suggest composband (or frogcomposband if you want to have access of a ton more birth and game settings/options but less balance ,
here the FCPB dev describe the difference between his variant and composband ), it's really good.