On my second playthrough, I've been trying to use different spells, and I've been trying to work out the benefit of spells that you display to improve stats (Agility, Eloquence, Sagacity etc). I've used a few of them but I've never felt they were wortwhile - I always feel like Improved Guidance or Improved Aid would be better. I realise those spells only affect a single check (rather than potentially a whole sequence) but on the other hand you can use them on any check rather than only checks of a particular kind. So I've often found spells like Agility and Strength just sit there clogging up my hand while I wait for a time to use them when they'll actually affect more than one check.
I wondered what other people's experiences or opinions are?