The link to their website 'history's greatest Mondays ' gave me access to this neat video
Open rates are pretty good on Sundays according to this chart from MailerMailer
The email arrived in my inbox in the evening at around 6pm. With over 60% of emails being read between 6pm and 12noon, they are certainly increasing their chances of getting it read.
But of course this is all going to vary depending on your business model and your audience. These stats are always a nice pointer but as in the words of Oscar Wilde
“Be yourself; everyone else is already taken”
Don't be like everyone else..everyone else isn't you!
As the offer runs for the next 3 Mondays, it will be interesting to see if they follow up over the next couple of weeks