I bought both a GSP Era Gold MkV and an Ear 834P and lived with both for a couple of months. Each had its strong points, and I could see how some people might prefer the Ear. But I preferred the GSP's speed and slam.
I saw in Audio Asylum discussions that there are some effective and not-too-expensive upgrades that can be made on the Ear, mainly upgrading capacitors and resistors and putting in better tubes (Telefunkens are probably best). After making those changes, the Ear 834P improved so much that it clearly bested the GSP (to my taste). But the Ear is more expensive to start with and if you have someone else do the upgrade on it, the Ear becomes about twice as expensive as the GSP.
So the GSP remains the champ at its price level, and better than many preamps costing 2, 3, 4 times as much.
I saw in Audio Asylum discussions that there are some effective and not-too-expensive upgrades that can be made on the Ear, mainly upgrading capacitors and resistors and putting in better tubes (Telefunkens are probably best). After making those changes, the Ear 834P improved so much that it clearly bested the GSP (to my taste). But the Ear is more expensive to start with and if you have someone else do the upgrade on it, the Ear becomes about twice as expensive as the GSP.
So the GSP remains the champ at its price level, and better than many preamps costing 2, 3, 4 times as much.