Are these chairs comfortable for long dinners?

Yes. The seat and back are padded, so they are more forgiving than solid wood chairs for a two-hour meal. The padding is modest, so very heavy sitters may feel the frame over time.

How hard is assembly?

Assembly is basic: legs bolt to the seat with the included hardware. Two people make it faster, and checking the bolts after the first week keeps the legs tight.

Will the blue fabric match my table?

The blue is a mid-tone upholstery color that works with wood, white and gray tables. Order one set first if the exact shade matters to you.

Can the covers be cleaned?

The fabric is spot-clean only in practice. Blot spills right away with a damp cloth and mild soap; machine washing is not recommended.

Do they work as accent chairs outside the dining room?

They can, in a home office or bedroom corner, since the padded back is comfortable. The set of four is best value when you actually need four dining seats.