Please review my Tech Interview EBook guide on Gumroad

Since a year of publication, I have 100+ sales on my tech interview eBook. It's going on without any promotion so far.

But no feedback on Gumroad so far. I would like to give out a few copies with a promise to get some truly valuable feedback!

As a thank you note, I am giving it out for $3 (90% OFF - never before discount figure) to first 15 buyers.

The following link works with the discounted price:

https://tipsnguts.gumroad.com/l/crrzat/e2f49vq

Thanks in advance!