Seems a good, pragmatic signing at that price. £13.8m for a full Spanish international in the current market is not to be sniffed at, especially if it frees up funds to address other areas of the squad.
Down side is that presumably we won't be getting both Sane and Aubameyang now, and I suspect from Brennan's tweet earlier the latter looks less likely.
Still, securing two quality internationals for under £35m is a good start to the window, and certainly improves the squad. Hopefully there will still be a 'marquee' signing this window.