I have to second what AndyTurbo said about there being hundreds if not thousands of batches of meth/ice in Aus, I mean there is probably not so many at a high end but when you consider the different circles they pass through and different cutters in varying amounts that any given dealer will add before it reaches the end user the odds of a few randoms on the internet scoring the same gear more often than not are extremely slim.
It is quite funny that in recent months people have been complaining I have noticed an increase in quality, whereas a few months prior to that I was copping crys that wasn't even worth the discounted price tag on it. Granted I have changed sources but I got off a new one (for shards anyway) yesterday and while it definately had a strange cutter in a sense that it tended to discolour easily and wasn't as good as my main guys tends to be it smoked out well and gave a good long lasting high.
I also have to agree that smoking has a very long lasting high it is just that the euphoria isn't quite so long lasting, also I believe since smoked meth hits practically instantly and you are watching the pipe as you smoke it this creates a positive reinforcement which makes one crave the actual act of smoking the pipe, this is what I tend to find leads to fiending but once I run out of gear and can't keep toking I am certainly stimulated for a period which rivals, if not outlasts, that of insufflation. IME oral amphetamines suck dick but it does last longer than other ROA. I am yet to try slamming and doubt I ever will with stimulants, so I can't compare that.
Bit cracked out at the minute, as though it isn't half obvious, fuck this shit is expensive... if only it was still 2007...