hi i saw your post and have some experience in this regard so i thought i'd weigh in if i may:
what cdin said is pretty much true, except for the part about not ever using sub. i was on it for about 3 years and yes, withdrawal from that kind of use is very very hard and takes a long long time. seriously, it's not cool. however, i'd just like to point out that in your case, sub may actually be a good tool for getting what you want from your treatment. here's my reasoning: if you are looking to get off strong opioids (MS and dilly qualify) sub can help you do that with less WD. it can do this because it is strong and you dont take it as often, so you kind of break the cycle of being high, coming down, getting high again. then, when MS and dilly are out of system and you are used to a steady level of sub, you can taper down and wean off of sub. weaning/tapering off sub is not a cakewalk but you can greatly increase your success rate by 1) don't stay on sub too long. for getting off of a regimen like you describe, 1 or 2 months may be sufficient, 6 months at most, but dont panic until that 1 year mark rolls around. 2) use as directed, don't up your dose to get buzzed or snort the pills. i'm not saying you will, i don't know you obviously but just my 2cents about not getting dependent on sub.
another thing is, suboxone is an excellent choice for pain management. it can control even moderately severe pain and there is less mental cloudiness than full agonists. also, you don't need your doctors permission to get on it. you qualify on two counts: if you find you are dependent on pain meds, whether illicit or in your case, prescribed, you can get into a suboxone program to treat the dependency. it is expensive but most insurance will cover it. if you are in pain, you can get into a pain management clinic, and i'm not sure, but i bet they'd be willing to prescribe sub instead of oxy, MS, dilly, etc. it is your right as a patient. oh, i forget this is an international community! in united states this is how it is. if you are elsewhere, YMMV.
again, don't take my word for it. cdin is correct about the long half-life contributing to BAD WD for a long time. if you do get it, you'll have to take less than what they say to and don't take it every day (you really won't even need to). just another opinion, ultimately it's up to you and your docs so good luck.
nirvus