A
Got them today, but most of the threads seem to suggest they're not much of an improvement over ES18, so should I return them or keep them, and if I do return which IEM should I get for around Rs. 2500?
E10s is much better than ES18 and no, keep them, they are one of the best sets under 3k.
E10s uses internally twisted cables, which are very hard to break.
If you have budget then go for E10S, else go for Delta as Piston has poor build quality and is not officially available here(out of stock). Delta has 2 years warranty, that's why I bought it a few days back, will be getting it by Friday I think.
It was long time since I owned the E10, I own a E80 now. I will do a review between my E80 and Delta. Lost the Piston 3 few days back but will do a review as I remember the sound signature.