This is a really low price for a great sounding and convenient microphone. Setting up ORTF with separate mics is a bit of a pain unless you have a decent stereo bar. The only other option for a ready-to-go ORTF stereo mic is a Schoeps for more than €3k. I have used this on piano but will also use it to record small ensembles, choirs, duos, trios etc.
Compared to Neumann KM184s, this has a tiny bit more noise and a tiny bit less in the low and high frequency range, but hardly anything that could justify the €1000 price difference.
ORTF spacing and angle is accurate. The capsules seem to have a tighter polar pattern than the Neumann KM184s, giving this a more distinct stereo image.
To justify the low price, it comes in a fairly nasty, though serviceable plastic case filled with packing grade foam. No hand-crafted wooden case, but it works. Superlux could do with coming up with an improvement of their super-cheap looking logo.
As others have noted, this comes with a hilariously short 5-pin XLR to 2x3 pin XLR cable. Obviously the intention is that you always connect standard XLRs as extensions, but it would have been nice if this was a 2m cable so that short connections could be completed without the need for additional cables.
Buy it!
Mic clip is fine.
One thing that has been noted about this microphone and which I can confirm is a sensitivity to RF interference. Having my jacket containing my mobile phone close to it caused the familiar clicking interference so watch out for this. Maybe this is something Superlux could address in the MkIII.