Depends on the requirements and sensibilities of the listener. If you want to listen to some heavy bass driven tunes, they are far from optimum choice. If you want any part of the spectrum colored, the same. If you want isolation, same. If you are on tight budget - you do not enter a Ferrari salon when shopping for a new car under 10 K - and so on and so on. Except for the IEM version, not portable at all - SRD-X can fairly be described as transportable and is way underpowered compared to desktop line electricity counterparts( to save on power consumption and give reasonable autonomy on batteries); IMO, Stax should have never produced such underpowered amps, it is like a Ferrari with 70 HP engine. Looks nice, but when you want to really drive the thing ... giving electrostatics driven in such compromised way bad name and misrepresenting their true capabilities. Ferrari would never produce a totally underpowered car, even if there was demand from the prospective customers.
If your journey through music and audio has brought you to the point you would like for certain tell a Stradivari from Guarnieri, between MODELS of Paiste or Zildjan cymbals etc - and your wallet can survive at least say 500 $/Euro for a good used set of amplifier/phones - then Stax may well be the best choice you can make for listening in quiet surroundings, particularly at home. IEM "Baby Stax" do not isolate at all and are useless outdoors, although they are only slightly less porftable than dynamic counterparts + separate amp. As noted above, there can be fit issues with those; if possible to try before buying, definitely do so.
Electrostatics shine at high frequencies and low levels - NOT a good choice if you listen mainly to MP3, as these compressed impersonations of recordings will get mercilessly exposed for what they are. The better the signal into electrostatics - the better the sound quality.
Ask yourself above questions - if you are ripe enough and can feed them with good signal, your choice should be clear. If not - the same. Do not get Stax solely for the simple reason no matter what other audiophilles might be using, upon your mention that you are a Stax user , you will get taken seriously and appreciated in the community. Do it for yourself. And remember - many that criticize Stax (except those who are true bassheads supremes, as Stax or any electrostatic can not rally deliver in that department ) are actually doing it out of jealousy for not being able to afford them themselves. Sad - but true.