The new version is not an improvement in any way. The developers have transitioned to a more "flat" environment, following the styling of Apples recent iOS, but in doing so, they have removed all of the character and depth of the original app. It now looks like something a low-level developer might come up with. The huge unused blue space at the bottom adds to the ridiculousness of the design. Its still functional, of course, but no longer unique, or special.
reddperc about CheckPlease - Tip Calculator, v4.4.2