Pros: Good sound, low cost
Cons: Cheap build, a bit too much bass for some music genres
The Philips SHE3590 headphones were listed on the Head-Fi Headphone Buying Guide. They are inexpensive and widely available. Most Australian electronic retailers stock them and they cost about AUD15. I bought these (in white) to replace my lost AKG IEMs (which I have since found again!).
Build quality is cheap and plastic looking. Nobody will think to steal these headphones and you won't look like Dr. Dre (Mr. N.W.A., coming Straight Outta Compton, y'all better make way) when wearing them.
I gave the SHE3590s a quick listen this evening to a variety of classical, pop and rock music and in comparison to Superlux HD681 (full-sized, open), Xiaomi Piston 3 (IEM for Android phones), AKG K324P (IEM) and Sennheiser MX365 (ear bud) headphones. These are all budget headphones and similarly priced.
The SHE3590's sound was surprisingly good. Of course, the SHE3590s do not sound as nice as the full-sized, open Superlux HD681 headphones but IEMs are typically used when small size and isolation are important. Compared to my AKG K324P IEM headphones, the Philips SHE3590s have more bass and, it seems, sounds less realistic. For example, the K324P sounded better for jazz music (Louis and Ella). On the other hand, the SHE3590 sounded better for acid jazz, where they emphasised the beat. The trouble with IEMs is that they often sound different and suit different styles of music. We have to buy them first before deciding whether they are suitable or not.
These headphones were a little uncomfortable to wear on my ears: the medium inserts were a bit large and the small ones were leaky.
I do recommend these headphones because they are inexpensive, satisfactory and readily available through normal retail outlets.