edit: nevermind, I can't read. no idea what experian is but I'll look into it. I still don't think it's worth the interest fees though unless you have a very low interest card.
The security is a huge deal for me - as an example, I used to play a popular online game with a subscription (not wow) and one month they glitched and charged everyone like 30-40x instead of once for the month. People who paid with a credit card like me were totally fine since the charged money was taken out of a pool of potential money that doesn't exist until you pay your bill (and it was resolved within a few days). The people who paid with a debit card had rent cheques bouncing, can't withdraw cash etc etc since their actual money was taken. Debit cards are pretty scary that way. Yes your bank will often reimburse you (although IME not as happily or as quickly as credit cards will) but that immediate loss of actual money is way more serious than a bogus charge on your credit card.
There might not be "too much to worry about" in the long term, but in the short term there can be a huge impact of having all your money locked up for even a short time, particularly if you don't own a credit card to fall back on.