かんばんにいつわりなし
it's true to its name; it's just like it says on the box
Also written 看板に偽り無し
Expression
あの男おとこ鳴なり物入ものいりで入社にゅうしゃしたけど、実力じつりょくのほど看板かんばんに偽いつわりなしだったね。
He came on board this company with a lot of fanfare and he turns out to have the skill and talent to live up to it.