First of all, imo the Isabella needs to be used with the foam tips that come. I feel they help extend the bass a fair bit. With stock tips the bass and treble were a tad rolled off, but with the foam tips I felt it was mostly resolved. There's also a extended burn in period.
That being said however, it's an amazing iem! Absolutely love it. Very warm, amazing vocals, fun bass and OK treble! Imaging is decent, and it's actually a fairly wide sounding iem too which surprised me! Very luscious and honestly dosent have too much negatives sound wise. Dare I say I even prefer it to the Campfire Andromedas due to better mids, cheaper price etc.
And finally, always love buying from musickteck, just feels like it's an excellent retailer!