I think the most controversial part regarding the IOs are the mids. The bass is relatively light, but solid (I was pleasantly surprised after reading reviews). The highs seem perfectly good (I don't really know what to look for in highs, to be honest). The soundstage and imaging are definitely...

I have the Pinnacle PXs and they both sound very different! I actually think the IO has more bass than the Pinnacles, but doesn't feel quite as warm overall.