Can anyone speak to the Pinecil?

I've bought Pine64 products before (pinephone and recently the pinetime) but I've heard Zach Freedman (void star labs) mention this before and rave about it. I wanted to hear from the ergo community what they thought about it before I bought one to start my keyboard building journey.

In addition, if I should buy one, what tips do you recommend be purchased? It looks like I can buy long/short versions of fine/gross tips. What's best for keyboard building? Here's a link to their pinecil products.