I'm personally not a fan of longer metcons the day before a big squat day (5x5 seems big to me); I've gone in the day after a long metcon to squat and usually have poor results. If that's not the case with you,then go for it. I seem to remember Justin L. saying something of a similar tone with regard for longer metcons before squat days.
I do like the two days off, but those five days in a row would be too much for me personally. If it has worked, then kudos to you. It does look heavily influenced by the Texas method, which is a great place to begin...