Parity accounts for roughly 5,000 of all Ethereum nodes (of which there is no "official" "1st-party" implementation) [0]. As a result of being so popular, Parity users were collectively robbed of $30,000,000 of Ether due to the multisignature (typically used to secure funds versus single-signature-required transacting) smart contract bug.

[0]https://www.ethernodes.org/network/1

[1]https://www.coindesk.com/30-million-ether-reported-stolen-pa...