IF you can stomach the right dose then these can make you feel absolutely amazing. I like morphine better than heroin (I smoke the h) because with h I'm always chasing a high, with morphine I'll be at a point where I'm chillin. H has made me feel better, but I didn't enjoy it as much because I was thinking about how much higher I wanted to be. Its a different sort of opiate feeling, more subtle, less noddy (at moderate doses), and it actually makes me chatty like I'm on a stimulant. Not everyone reacts to morphine the same way, but take one and give if a try and see if you like it.
I weigh 210 and took doses of 120-180 mg crushed up to be where I wanted, but I could get high off one 60. Unfortunately for most of my friends they couldn't eat more than half a pill without puking all night.
Methadone is a more hazy high, it's definitely more black out prone than other opiods. It'll make you feel good but it won't be like something you've had before.