We had our first fully wireless IEM practice session tonight and overall I am very glad we have the IEMs. We have 2 Shure PSM300 xmtrs on the same frequency but we synced me and the drummer to one and the other guitarists and singers to the other. We all have the Shure P3RA receivers. Guitarists have the Shure SE 215 earbuds that came with the xmtr. Drummer and bassist (me) bought the Shure SE315's to get better low end. I did bring one splitter because a member said he had another but he did not find it so we fed one xmtr off the other to make sure everything worked. We really only needed one transmitter for tonite. The guitars and vocals were on left channel and bass was on both but heavier on the right channel. Drums were kept on the right channel along with bass and my vocal. We set them up with Mix Mode instead of Stereo so we could balance between left and right to our own taste. I set my receiver to emphasize the bass and my vocal and had the other vocals and guitars to where I could hear them nicely balanced. It was difficult to hear at first. I was hearing a lot of bass distortion and we were overdriving the transmitters. We turned the input down and that cleared the distortion. I also discovered that I had not set my earbud correctly into my ear but once I got it set properly, the clarity was absolutely amazing. I cannot say enough good things about using the white triple flanged sleeves. Made all the difference in providing great bass response and clear, clean sound for me. I was able to hear everything and everyone and the mix was very good in the IEM. I'd say it was a complete success and it should get better. The SE315 earbuds did a good job with the low end and I could hear my bass clearly. Not as full of a low end as I am used to but the mix out to the main is what matters. For my purposes, it was pretty damn good. It helped all of us sing better because we could hear ourselves better. Definitely. I was impressed by the amount of improvement. We play 90's so it was loud before we tried the IEMs and we always had difficulty hearing ourselves thru the monitors and avoiding feedback. It did not make the drummer play any quieter. It did allow us to hear each other a lot better in a very sound-bouncy room. No feedback issues and we expect feedback to be eliminated now that we won't have any stage monitors during performance. The rechargeable Li-Ion batteries one member had lasted as long as the alkalines and cost $8 for a pair compared to $100 for the Shure battery. We ran them for 3+ hours. These are the batteries: http://www.amazon.com/Panasonic-BK-3HCCA4BA-Eneloop-Pre-Charged-Rechargeable/dp/B00JHKSL28/ref=pd_sim_23_1?ie=UTF8&dpID=510m7pTciWL&dpSrc=sims&preST=_AC_UL160_SR127,160_&refRID=06MXW2JGANYQH8DSG44J I want to thank TB member Scottkarch for the EXCELLENT guidance he provided my band to get us started on the right track.