Yes, mainstream is the word. GR02 is a more consumer friendly product, more for mainstream crowd. I let that friend of mine tried GR06 and Rockit R-50…she said they sound “hollow?” I was like “Huh hollow?” Then after some clarification, I realized by “hollow” she means their sound is more spacious…more airy. She is not used to that kind of sound. She prefers GR02.
As for GR06, I have been using the stock tips since last November. I have not tried others. Maybe I should go venture.
I have been getting loads of 'mainstream' earphones lately and i prefer the GR06 to most of them. I can see were she comes from when saying the R50 are hollow (i have not tried but have other TWFK) and its not hollow but is a way to describe detailed and transparent i guess. It is quite easy to convert from the sound but was easy for me as i never enjoyed it.
Yeh really start messing around with the tips!