Got these headphones at an absolute steal of a price at a special limited price of only £69 which at that price it would be damn right rude not to add these to my growing headphone collection.These at that price or in fact any headphone below £150 I would say are the best bargain in HiFi land.Build quality is really not that bad, I have heard lots of negative reviews on the build quality of Hifiman headphones but I do think that was based on earlier models or production runs as they seem to have now got their act together on build quality.The headphones are well built and use of decent enough materials with a mix of metal and plastic. The pads are comfortable and big enough to accomodate my slightly larger than average ears. A mix of soft pleather with a fabric surround as where it touches your head, comfort is very good in my opinion.The cable is decent enough and they have upgraded this cable from earlier 400 models, fitting an aftermarket cable is easy enough as the fittings are standard 3.5mm connectors and you can easily run these balanced too with a cable without breaking the bank.I run these on my Fiio K9 Dac amp on medium gain at around 2pm on the dial and I do listen loud on my 58 year old ears. Sound is extremely clear and present with stonking amounts of smooth treble detail presented. Mids are quite forward but very present and vocals in your face if you like that kind of presentation (not unlike Grado presentation).Bass is very good , definitely not bloated or muddy but it does dig quite deep and has a decent amount of sub bass before rolling off.Soundstage is not huge but definitely bigger than my HD600 but imaging is not so precise as that reference headphone. Imaging is good enough though especially for a headphone at this price point.If you can get this headphone below £100 its a no brainer provided you have a half decent amp to power them, even at their list price now on here at £129 I do think these are stellar value to get into the FUN of Planar Magnetics.Out and out recommendation from me!