Cure Serious Wounds potion will heal, on average, 18.5 hp, and it will cost you 750gp, and it will take either a standard or a full round action to use, and it will provoke AoOs unless you did some further investment to prevent that, and on top of that it probably smells bad and tastes bitter. Yuck. For the same price, you could have gotten a Wand of Cure Light Wounds (275hp total instead of 18.5hp), a Wand of Lesser Vigor (550hp total instead of 18.5gp), or a Healing Belt (Either 6d8 hp (average 27 hp) a day, or 18 hp (same as the potion!) per day if you burst heal, usable as a standard action that does not provoke attacks of opportunity.)) Would you rather get 18 hp, or 18 hp per day?