Edit: I skipped the second page...big mistake XD
I am excited by the idea of getting alternative versions of a spell via the upgrade system. Effectively, giving us 1,200 skills for the price of 400. My cold little munchkin heart is gleeful for the extra degree of control and specialization.
I - any one here remember Secret of Mana? (Seiken Detsu 2?) Standard ARPG for the SNES (now available on steam! but I digress). Anyway, you leveled up you magic by casting spells, and things changed as you leveled them up - the Hail spell dropped bigger ice balls on enemies, for example. Anyway, eventually (with a fair amount of grinding), you got your spells to level 8..and then you hit a hidden random chance, and the spell goes nuclear XD Literally, in the case of 3 spells. Fireballs become Flame Dragons, Earth Slide summons a nightmare mudball that grins at you before demolishing your enemies. The visuals are insane, and at the initial playthrough, entirely unmentioned and unknown. It Blew My Mind, is what it did. Made one heck of an impression.
Of course, these were actually a bad thing - most people figured out that you can stun lock a boss by timing spell casts properly, but the "Super Spells" prevent that due to how they work, which means the bosses could sudden get at you. Even if you liked the damage boost they gave, it wasn't worth it, compared to the ability to keep the boss from potentially one-shotting you (certain SoM bosses Did Not Mess Around XD).
But the sheer unexpected OMG WTF BBQ moment the first time it happens, I can't even explain how awesome it was. I literally leveled up all my spells to 8 just to see what the new rare effects, even though they were worse over all. They rarely disappointed.
I've been told that I can now get that feeling, 800 times. I AM SO UP FOR THIS. OMG You have no idea. Even if I never use anything other than level 1s, I want to see all the neat things that are being planned.