This might be one of the best wireless mic sets money can buy. First, let me point out the cons: 1. Yes, a microphone's frequency response will be out of spec, so you can't use it, buy a second set and just use one of the others and still have one hell of a deal.2 . I can't find a way to turn them on when power is applied - which means you have to turn on power at the rack and then manually turn on each of these receivers (unless I'm missing something)3. They cannot be rack mounted without placing them on a rack shelf and using double-sided tape4. The antennas are not designed to be folded for easy storage in the concert case, it is better to remove them when transporting5. The antennas are on the back. So if you mount them in a rack, they'll be behind a pile of metal, reducing their range6. On a dark stage you can't see polarity so you can ask someone to put the batteries in but you won't get power and have to do it over and over again. They are difficult to pull out once you have them in place. Okay, okay, what makes them great? 1. They are very well built. As others have pointed out, they're heavy in the hand, feel every bit as good as our Sennheiser, like real pro gear. We didn't drop one, but I have a feeling if we did it wouldn't have shattered like other budget mics.2. They look good and when mixed on stage with our professional equipment, people can't tell we didn't spend a lot of money. The range is more than sufficient. We haven't found a stage larger than the coverage area, but our receivers are in a STAGE rack, not behind a sanctuary or anything.4. The infrared frequency is instantaneous and accurate - it never lets you down, unlike some other even higher quality brands.5. The sound quality exceeds all expectations. I record every performance, which means I've isolated the audio from every mic and participant, and can use the SM57 and Innopow to compare a wired Sennheiser to a wireless Sennheiser. And guess what? In almost all cases, Innopow sounds great! I'm not pulling your chain here, from soft to loud songs, they are just amazing. And their pattern is pretty good, so they don't pick up too much noise like drums, and they have good feedback. As with most microphones, the bass can be amazing if you drive it hard. The only weak point is that when you strap on someone's mic and put it on the cups, distortion is a lot easier than the 57.6. Price matters a lot to us because although we have 3 more expensive Sennheiser systems that were purchased for key members of our group, other members have come and gone and others have made no investment - they are perfect for them and for guest mics. It's hard to justify buying someone else's gear so they get what they get, right? At least they get a very decent mic that they're not ashamed of falling behind! So, 6 pluses and my 6 minuses. The advantages certainly far outweigh the disadvantages. And I have a follow up after buying my first system in February, I bought a second system after one of the two mics died. I don't know what happened, it wasn't dropped but the batteries got red hot as soon as you turned it on. Why isn't this a "scam"? Because everyone has problems - my dear bass amp died, died at the same gig! In order not to cry, I ordered another set of microphones. I mean what's the price right? But wait - there's more. On a whim I contacted the seller and told him what had happened early Sunday morning after our concert. and on Monday morning they replied to me saying it was probably a solder ball on the board - and they sent a replacement. I got a replacement from them just in time for the rehearsal on Wednesday. I've used it at gigs on Friday and Saturday nights and it sounds just as good as ever. Meanwhile, my expensive bass amp will be in the store by the middle of next week before anyone sees it. So it's not Shure, AT or Sennheiser, but I wouldn't (and wouldn't) hesitate to buy it again or recommend it to my friends.