I first watched this anime series maybe two years ago, then I watched it again just recently.
I found this anime very entertaining. In fact., it's one of my top favorite anime series to date. I just love the flow of the story, the characters' development, the action scenes were so flawlessly made, the slight romance (apparently, one of the very reasons why I was so fond of this series--one might think it's a harem type, but in point of fact, it isn't. I just love Matsuri x Yorito) and of course the shocking truth behind the real identities of the siblings.,
The ending was kinda sad though. But I understand why it had to happen.
All in all., Sola was a really, really wonderful anime.