I have used low fees without many problems, sometimes to my surprise the transaction gets confirmed within a short period, some others I've had to wait days for them to confirm. On a couple of occasions after waiting forever, the tx were discarded by the network and the bitcoin returned to my wallet.
I always use default fee 0.0002 btc (can be said low fee). Because I usually use exchange sites for transactions (use c-cex). So the transaction and confirmation can be said faster. Maybe I should wait about 10-20 minutes to get confirmation?
Yeah, default fee at times seems to be low. This has never been a issue for me till date though lot of users complaint the delay in transaction confirmation a major issue. With me, I just place increased transaction fee during the time of gambling for faster confirmation whereas for normal transactions blockchain default fee suggested is paid.