I own 2 different models of electric reels.
The first one I bought is a Daiwa tanacom 1000. This is a great low cost electric reel that gets the job done. I ordered mine off Ebay from Japan & it was the cheapest I could find it for.
I maxed out around 2,000' if memory is correct & I wanted to search deeper. After lots of research I went with the Lamborghini of sportfishing electric reels.
I bought a shimano beastmaster 9000. It holds 4,600' of line and is FAST. Males a huge difference with checking bait or moving spots. It also has a ton of torque. East coast folks use them for 400lb swordfish. Its pricey though.
I can Honestly say the diawa will get the job done the same. The shimano is like a red sports car.