Yes I did a warranty exchange. It took longer than I would have liked since XP's were being delayed at that time.
There is no RMA#
Tracking to canada costs a lot of money
its covered on their website here.....
http://inhalater.com/shipping.html
I really wish there was a US warranty option though.
The difference with the twist and grind the herb rubs against the exterior of the capsule and then when you insert it creates more glue/stick between the capsule and the polymide on the heating chamber. With the suck approach no sticky trichs are every touching the outside of the capsule and therefore it stays cleaner. I used to do the twist and scoop and I still do when I want to pack the capsule more tightly. otherwise I do a suck. I have to agree with dreamer after doing 1 for 3 months and then the suck since then that the capsules insert and remove easier and I can stretch cleanings a little longer. Like I said, I still use both techniques...
On longevity. I bought mine even before dreamer and my INH 004 works great except for the same bug dreamer has. Thats why I sent mine in for warranty. I have been happy with the performance of the XP. It clearly exceeds the original. My first XP died. The 2nd is less than 2 weeks old and still working well. Only time will tell.
I really wish there was a US warranty option though.