I've been using this microphone for about 3,5 years. I'm a field recordist and sound artist. I record in urban and nature environments alike, all over the world. Over the past years, this microphone has become one of my go to microphones, especially for quick setups and run and gun ambiance work. And it's great as a backup or second mic on an expedition. Apart from this microphone, I also use the DPA 4006A, DPA 4060, Rode NT4, and Lom Usi a lot.
The BP4025 is a very quiet and natural sounding microphone, which delivers a lot of detail in its sound. It has a very low self-noise making it great for nature recordings. The XY stereo image is a tad smaller than other XY stereo mics I know, and because it uses a special mounting of the large diafragms, might take a bit getting used too. But when it is used well, it delivers a beautiful and enthralling stereo image, while remaining very uncolored. Because it uses large diaphragms (the only stereo mic I know that does so) it has a very present low end response. When I use this mic in urban areas, this can lead to an overpresent low end, but that's easy to correct in post. If necessary, the mic also sports a bass roll off. (I've never used it). And sometimes I've used this mics over my other ones precisely to take advantage of the low end response. The LDC's are also responsible for a quite lush midrange. The frequency reponse tapers of after 17K, but because of the fullness of the sound below this frequency, I rarely notice that.
I have my BP4025 fixed quasi permanently in a blimp, and it's great for quick setups and shoots. I've taken it everywhere in moderate climates, even sometimes in quite wet ones, and it is build sturdily enough to withstand a reasonable amount of abuse. I've not had humidity issues with it, but this is not the microphone I would be taking to the rainforest. For most places, it performs most adequatly. It's a bit front heavy, so get the correct suspension for it (I use a rycote duo lyre mounted in a rode blimp).
For this budget, I know of no other stereo microphone that would outperform the BP4025 for quiet ambiance recordings. And if you can live with the slightly smaller stereo field, it works great on music recordings too. So if you're looking for a versatile and quiet microphone that doesn't break the bank, this one's it.