I decided against it for three reasons:
R1. Grayskull is a chip that they made in 2020 ([1]). They already have 2-3 newer chips generations available internally (Wormhole, Black Hole, Grendel), see [2].
R2. The price of the cards is high. It does not look like a too good value, even if judging by paper specs, and then the reality will always correct that down.
R3. The primary Tenstorrent founder recently left the company to start a competitor, Taalas, while taking some of the Tenstorrent talent with him ([3]).
I decided to wait until at least Wormhole cards available for purchase (hopefully, at a better price), before committing my time and money to Tenstorrent, even if just for exploration.
1. https://insidehpc.com/2020/05/tenstorrent-ships-grayskull-hi...
2. https://www.semianalysis.com/p/tenstorrent-blackhole-grendel...
3. https://betakit.com/tenstorrent-founder-reveals-new-ai-chip-...