Shure SE535-CL

This is my third pair of SE535s. They come supplied with a decent range of ear buds to ensure a good fit, give great sound isolation (can almost be too much at times), and have great sound quality. With the right ear bud choice they are comfortable to wear for long periods of time. So why four stars? The cables are notorious for breaking -- an easy fix but temporarily renders the item useless. I've had great support from Shure/Thomann with regard to this issue, but it does take time to get the item sent off, evaluated, and replaced. If you don't have a spare set of in-ears for gigs I'd suggest buying a spare cable in case the cable gives up on the job. Overall, I think you'd struggle to get something better in this price range but be aware of the cable issue.

Good earphones in overall.
If you had experience with something like Westone's
IEMs, you might find Shure's are a little uncomfortable (just not so ergonomic, but if you do not use them 24/7 they are bearable, and later you will get use to them any way), But Westone's are not so reliable.
Shure's are much better.

Sound is good as well, however not very linear.
Sensitive highs, powerful and clear lows. Many people notice, that mids are a little too loud. You must use EQ for music listening.
They can be good for voice monitoring, I think, but this is just my supposition.
However they provide better sound isolation, than Westone's, and they sits better
in the ear channels, even when you use the same ear tips (yes - Westone's and
Shure's SEx35 can be used with the same SHURE PA 910 ear tips)

I must notice, that, if you use them 24/7, then the moist from your ears will start
to accumulate inside the earphones, then there will be a drops of water, and the water
can cause some cooper surfaces to corrode, thus causing damage to the circuits and
cable's sockets from inside - this is not fixable, and cleaning the sockets will not help. NEVER use them 24/7. However, that is not very pleasant anyway, because your year channels will start to itch after like 8 hours of usage )).

In overall - very good quality and performance/price rate.
The only better IEMs are probably 4-drivers Shure IEMs (it is quite a new model), and custom Ultimate Eears IEMs, but their prices are beyond my
pocket size )).

First impression: if you put them on, you will never want to take them off :).

The Shure SE535-CL is an extremely well sounding pair of InEar head-phones with extremely good definition and clarity enabling to hear all instrument clearly. Also in low volumes, due to the perfect sound insulation towards the surrounding.

During a gig you will probably have the best (HiFi) sound, even compared to the PA!

One disadvantage is the connector between the cable/s and the headphone it self, when used for a while there is a quite big risk of oxidation due to the salt in human sweat (I'm on my 3rd pair now), althoug Thomann has replaced the faulty ones without any problem.

If you are going to or is already is using InEar, this is the professionals choise.