Unlike the 33 month Barclaycard deal, where you need to transfer your existing debt within the first 60 days to get the 0% deal.
This card allows you to transfer a balance as many times as you like during the 17 months offer, allowing you to still get the 0% any time instead of just the first 60 days.
Points to note....
1 = You can only transfer up to your credit limit.
2 = 0.9% fee applies on EVERY transfer you make.
Fee savings compared to Barclaycard ....
Transfer £2000 to Barclaycard, fee 2.79% = £55.80
Transfer £2000 to Santander, fee 0.9% = £18.00
Obviously if you need the full 33 months of the Barclaycard then its better as it gives you more time, however if you can clear the balance sooner, and dont want to to pay as much in fees, then the Santander is ideal.