Is this combo enough for a quarter-acre yard?

For light trimming and blowing on a small lot, yes. The 12-inch swath and shared battery mean larger lawns will need more passes and possibly a second battery.

Does the blower run on the same battery as the trimmer?

Yes, both tools use the same battery pack, so you swap it between them. That is the main reason to buy the combo over two separate tools.

How long does the battery last?

Runtime depends on the battery size and on whether you are trimming thick grass or blowing light debris. Expect shorter runs under heavy load, so keep a spare if your yard is large.

What string does the trimmer take?

It uses standard replacement trimmer line for a 12-inch cordless head. Check the spool type before buying refills, since generic spools do not always fit.

Is it hard to assemble?

Assembly is straightforward: attach the handle and guard, then charge the battery. Most owners can set it up in a few minutes with the included instructions.

Can it replace a gas trimmer?

For routine trimming around a home, yes, with less noise and no fuel mixing. For thick brush or all-day work, a gas or higher-voltage cordless trimmer is the better fit.