As far as the stock pads go, I did HPDE and they were just fine as long as you get decent time in between sessions (even assuming you push harder than me, sounds like you're HPDE2). For reference I probably had ~2h in between sessions, and I was keeping up with 3.0s on the track. That being...
Just over 2K miles, so far no issues at all. Also got mine back in December for pretty close to what others are mentioning ~ $41-42K OTD, and I bet you could get them slightly cheaper now like SupraMKV2.0 was saying.