I personally think is more of a solid reel and it’s has more line capacity too. The new Zillion SV TW and Zillion TW HD are 100 size reels. The USDM Zillion SV TW, Zillion TW HD 1000 have brass gears and the Zillion SV TW 1000 has aluminum gears. If you are going to go down the Zillion road TW HD 1520 is the one you want.