Thanks for the input, i'll try to add some links to tutorials to the next version.
About the 100 satoshi's/byte =>
https://bitcoinfees.21.co/api/v1/fees/recommended still recommands 120 satoshi's/byte for a 90% chance of getting into the next 3 blocks, and 100 satoshi's/byte for a 90% chance of getting in the next 6 blocks.
I could probably show both... but 120 appears to be necessary for the fasted confirmation time at this moment.
Great one but I think there are already some explorers like : live.blockexplorer.com showing mining preference (which is a very cool stuff) and also recently I think blockchain also updated their explorer as it is now also showing fee/byte. It would be great if you can bring mining preference and confidence concept from live.blockexplorer.com into your site.
Also notification ringer when a bitcoin transaction gets confirmed and also maybe like link to transaction accelerator service would be cool.
Thanks for the feedback, to bad, but live.blockexplorer.com seems to be down at the moment, so i cannot check it out.
About the notification ringer: would it be best to change the browser's tab title, or do you mean sending an email or something?
BTW: the link to viabtc is already there, but i'll make it a bit clearer in the next version