By installing this mod, you will not be able to chain-cast signs without thinking, nor will you be able to freely cast quen when the previous one breaks. It will also prevent you from blocking endlessly against lightweight enemies, but without affecting your mobility.

Does not add any stamina costs for attacking or dodging, you remain as nimble as before.

The skills description claims that the skill gives you up to 20% extra stamina regen rate, yet it seems to use the faster stamina regen rate from outside of combat (about 1s) as the base for that calculation rather than the slower one you have during combat (10s), meaning that your stamina meter during combat was filling up in 3 seconds or so. This enabled you to pretty much cast signs whenever you wanted and also made all the stamina regen-improving alchemy items, gear, and other skills redundant.