I watch Las Palmas a lot just because I enjoy watching him so much and I definitely think, right now, he's good enough to play for someone like us, but he's not always been as good as he is now. I used to watch Valencia quite a lot whilst he was there for one season (mainly due to Banega) and he looked so out of his depth. I didn't rate him highly at all. I just think he's a late bloomer, though he is a Las Palmas fan. He never played any of the passes he does now at Valencia (though he did at Rayo Vallecano but not as consistently as now) and he never took responsibility, but looking back, it seemed like he never really got a fair look in which could come down to himself of course.
So, despite his age and lack of experience at the top level, I think he'd be a fine signing because, to me, he's only just entered his prime only last season. He's up there with Pogba in terms of playmaking, and in regards to his defending not being up to par, that could be down the managerial instructions because he's so important to them attacking wise they might not want to weigh him down with defensive responsibilities.