今迄

Kyoko and Rumiko have both asked me about the expression so far.

So far = a long distance
"My office is so far from my house; it takes 2 hours by train." This sentence has a negative nuance.

So far = until now (optimistic)

Kazuko: "How many people are coming to the party?"

Kenichi: "So far, 12 people have bought tickets."

So far = yet (pessimistic)

Minaho: "How's your new microwave oven?"

Takashi: "No problems so far."

So far so good = no problems yet (happy but slightly pessimistic)

Kentaro: "How's your new microwave oven?"

Emina: "So far so good!"