And how exactly did you arrive at either of these two? I mean, not to sound negative, but I've *never* seen either mentioned anywhere by anyone other than you here and over at iLounge. They may be reasonable earphones for their cost, but I doubt it. In general, cheap and good gets to be known because it's cheap and it's good. Cheap and bad just remains unknown to be picked up at Wal-Mart and flea-markets by people who don't know enough to research products first (which you at least are doing).
For good or ill, it's very hard to find decent sound quality in IEMS and canal phones without spending more than $20-$25 (and the Marshmallows tend to be the stock response for that sort of price range around here).
Here's my blunt answer: for what they cost, they shouldn't be much of a risk. If their cost really is an issue, re-think what you're doing and live with the iBuds or whatever you've got a little longer and save up for more of a sure thing. We all have our "nervous" point for what something costs, if these really are a significant purchase, you will do yourself and your ears a favor by waiting a little longer to go for something with a more solid reputation.
Realistically, you're going to need to spend in the $75 and up range if you want good sound, but you can do a lot worse than some of the solid performers below that price. For around $75 you can get solid products like the Audio Technica ATH-CK7, Etymotic ER6i, or Ultimate Ears super.fi 3. Move down to around $40-$50 and you can have something like the Sennhesier CK300, respectable if more than a little bass bloated. Move down to around $30 and you can have the Creative EP630, which is decent enough for the cost, or something like the V-Moda Bass Freqs, sort of a hybrid canal earbud design that seems to be making somebody happy.
