AKG K-52

PROS:
-Very lightweight and comfortable;
-Decent quality for 30€, but do not expect "high quality" as I saw many people (and AKG) writing;
-2.5m cable, which could be a pro but also a con :D ;
-Decent bass for the price.
CONS:
-Very bad isolation;
-Really bad frequency response: highs totally messed up, mids with strange behavior;
-Consequentially, stereo image is pretty messed up;
-Materials do not feel like solid, balanced or strong - they're still acceptable for price range.

I am a master's degree student in electroacoustic composition, ergo: not an expert but not just an enthusiast.
I have to say my recent headphones have been AKG702 and Beyerdynamic 990 PRO, also in these days I am listening in a very great studio (well treated - enormous Genelecs), so my standards may be strongly influenced by this.

So, these headphones are pretty much ok for the money you're about to spend. But do NOT expect a decent isolation, a reasonably fair frequency response, a nice stereo image.

I just thought this pair of headphones would have been something better. Unfortunately it does not satisfy me, so I will send it back.

Quality is excellent, personally, I found the following points.
1. Treble response is too high and not realistic when compared with KRK pro monitors, so if I use it for mastering my balance will be off.
2. Fit - A Headphones deliver bass response based on how good it covers ears airtight in my opinion, the ear cups are not oval, they are round and too big for most of them I think, leaking the air all around and very difficult to judge BASS and not convenient. Ear cups are a bit rough.
3. I know you get what you pay for, but for the price, I shall say very nice but I do not recommend them for mixing.