Holy Black met my expectations of a premium slant razor. Right size with the right weight and a 'killer' look. Absolutely recommended.
I've been shaving with a slant Merkur 39C and a modified 33C for many years now. I love sturdy and chunky pieces so when I saw that one, I just fell in love. Compared to my 39C, I would say it's a tad more aggressive but the roundness of the head makes it feel ultra comfortable. I use Astra Superior Platinum. The result is on par with 39C, maybe just a bit better. But the feeling in your hand is awesome (if you like heavy), and the color and size make it so desirable.
I've been using double edge razors for 10+ years. Having only ever used my Edwin Jagger razor I was skeptical to switch. The weight of this is classified as heavy but it provides a great shave. I have often cut myself with my other razor. The angle of the head helps keep the angle perfect, overall, a great cut. I'd recommend this to anyone, novices included.