Yes, we've used them for several years. Fizan is an Italian brand distributed in Australia by Kathmandu under their own label. Been around since 1947 making ski poles apparently (for detailed product info etc see
http://www.fizan.it/history.php).
I've got the basic one ($30 on sale) about 3-4 years old and it's still OK. Has been used in many places including Tassie numerous times. Quality is quite good. They're generally lightweight and fairly compact. I find that I can stow mine inside a reasonable sized daypack. Does the job for me when I need it (dicky left knee on steep descents mainly). I think either Outdoor mag or Wild reviewed them amongst other brands within the last 12-18 months.
We've found no significant problems with them. Mine is sometimes difficult to secure, I suspect simply due to wear and tear, but still quite useable. Keeping the internal parts clean and dry helps. Getting parts is the only problem I can think of, if you were to lose a mud basket or break a tip etc KMD don't seem to keep spares.
While there are probably better poles around, the Fizan ones (esp. when on sale) seem to be good value. I bought the current basic model for my son about 12 months ago at 60% discount which ended up being about $23-00. Ridiculously cheap, I'll never understand KMD's pricing strategy.