I appears to have a much flatter response than most of the popular budget LDCs. Same as the NTK but with solid-state preamp. I'm not very experienced with mics. They sell used for under $200. What do you think?
If you want a reasonably neutral LDC and have an interest in DIY, I strongly recommend Microphone Parts' kits. The S3-87 is a very balanced, natural sounding mic with low noise and reasonably flat frequency response and multiple polar patterns. They also offer kits to replace circuits and capsules in existing mics.
I've built 87 and 47-style mics and have been very impressed. You're getting performance more like a $1,000-$1,500 microphone for around 1/3 the price. The 47 mic kits are a bit more 'coloured' with a transformer-coupled circuit that introduces some even-order harmonic distortion, while the S87 uses a transformerless circuit that's very low noise/low distortion. The 87 capsule is a little brighter than the 47 but easily EQ'd to preference. The kit also includes a socketed capacitor you can use to alter the high frequency response of the microphone, to have a modest HF boost or a more flat profile.
Companies like Rode that market budget microphones are notorious for marketing BS, misrepresenting frequency response (usually by dramatically over-smoothing the mic's response), distortion characteristics, and noise floor.