That depends on a lot of factors.
If by "indulge" you mean IV/snorted/smoked usage of big doses of strong full agonist opiates (morphine, heroin , >30mg oxycodone), you will need a lot of kratom to get a buzz and it will not be anything like sniffing an OC.
If you're talking about ~20mg of oral hydrocodone a dose, then yeah it will be pleasant.
The important thing to remember is kratom has actions on the adrenergic system and can play with blood pressure/act as a stimulant depending on strain and dosage in addition to its opioid effects. It will never be a true replacement for full agonist opiates, even if it can be pleasurable.