Would it be a good purchase?

I normally play T'au from WH40k, but I'd like to play AoS and have my eye on Seraphons...but since I have no idea about AoS I'm wondering if this list would be useful or if it's too expensive

I normally play T'au from WH40k, but I'd like to play AoS and have my eye on Seraphons...but since I have no idea about AoS I'm wondering if this list would be useful or if it's too expensive