Is this a reliable weapon?

First time playing Elden Ring and I've basically been using this my whole playthrough. I'm pretty good with it although it would be nice to have something faster, like something for a dex build while still doing enough poise damage. Like everytime I level up this weapon I'm sceptical if I should. I did alsee that the Claymore was good but I haven't found it yet so I'll try it out tomm. All I need to know is if this weapon is realizable all the way to at least Radagahn.

First time playing Elden Ring and I've basically been using this my whole playthrough. I'm pretty good with it although it would be nice to have something faster, like something for a dex build while still doing enough poise damage. Like everytime I level up this weapon I'm sceptical if I should. I did alsee that the Claymore was good but I haven't found it yet so I'll try it out tomm. All I need to know is if this weapon is realizable all the way to at least Radagahn.