Concerta and ritalin suck fat donkey dick, period. Addies are great, xr or ir, either way those bitches stay under my tongue for a bit before they go down the hatch, the xr's taste extra bad, the ir's are sweet, weird right? Vyvanse is a serious motherfucker, at first i underestimated it, shit is no joke and will creep up on you. Honestly, it lasts way too long for me and depending on what i eat through the day, it can take a while to kick in, then seem to wear off until i try to sleep, lol. But, 10 mg of melatonin and 25mg of benadryl gets me to sleep hella quick. Vyvanse taste straight up like meth when i open a cap and pour the powder under my tongue.