Sennheiser E 901

Had been looking for another kick mic to complete my kick sound for a long time. I'd gone through several mics, the D112, D6, Beta 52, E602 and I'd settled for the Beta 52, but I was still lacking a focus. I knew getting another kick mic to compliment the sound would give me a much better sound. My first choice was the Beta 91 but it seemed a bit too clacky. Wasn't very focused for me and seemed to add an undesireable sound that I couldn't EQ out to make it work with the Beta 52.
I love the other Sennheiser mics I have and this seemed like the perfect choice. I've paired this up with a Beta 52 and an E602. I now have an amazing kick sound before I do any EQ. The E901 is very focused, gives me a great punch/slap. It's very mix ready. The connector on the mic is solid unlike the one on the Beta 91. It's just a very good quality piece of kit. I'd recommend this to anyone who's searching for a second (or if you're like me, a third) kick mic to enhance your sound, either in a live or studio setting.

I choose this primarily for the convenience of being able to throw something inside a kick drum and to not having to worry about setting up a mic stand. Reviews on its sound quality seem to favour this over similar offerings from Shure and Beyer Dynamic.
It's heavy - I assume to prevent it moving around, which it doesn't - and it sounds good on a kick drum and doesn't distort.
It uses an electret capsule, tuned for high intensity sources so trying to record anything quiet with this (e.g. voices when it is on a desktop) will result in unwanted hiss.
Beware using this as a jobbing live sound engineer, the holes in the front skins of some kick drums are too small for it to be passed through.