We got this for use in a new meeting room and we were in a rush to get a mic, so I ordered from Amazon with next day delivery and someone else went a bought one for £19, the £19 one worked, OK, not great, picked up either too much background noise, or none at all, and we needed it to be able to pick up the speakers voice as well as the questions that came from the audience, OK the room only seats 30 so a small-ish room, but this mic did far better that the more expensive one, it had less features built in, but the quality of the audio was far better, it picked up the audiences questions, but not them rustling biscuits or slurping their teas.
This seems to quite a sturdy piece of kit too, and for the price I do not think you can do any better, the clip is sturdy and holds the mic in position well and does not let it pop out at the slightest accidental tug on the cable.
We liked it so much we have ordered a few more for the older rooms.