Kraken is basically easy. They have a 4 tier process. The 4th is only needed for very large transfers. The first three tiers took me under 15 mins to complete. Basic verification. The only slight difficulty is that they ask in tier three for a photo holding the ID by your face and date (similar to Steem introduce yourself) which is easy enough it's just the link isn't obvious so easy to miss. They take bank transfer which are easy enough to do. Just don't do what I did and forget the unique reference number! However they moved very fast to sort it all out for me and replied to support queries within a couple of hours max. It did take 10 days to get the transfer allocated (this was my mistake) as they only have a few people enabled to allocate interferences deposits missing a reference tag - a good safety measure. Withdrawing bitcoin is a nice process and you can add names to adresss's for easy repeat withdrawals. Of course the other advantage of Kraken is that you can easily trade/buy EOS for us @Dan fans. So to summarise although the Kraken interface takes a little exploring, its highly verstalie, the set up feels sturdy and the support is superb - and the verification is quick so long as you are careful to upload each item they request inc. the selfie/ID which is an easy to miss link.