If you're already using i2c devices then it doesn't use up any additional pins to add the i2c LCD. Plus multiple i2c LCDs can be used without increasing the number of pins required because the one you linked allows you to pick one of eight addresses with the solder bridges on the PCB.Is there any real advantage of using I2C over serial for LCD's?
Just saw that photo. Would be simple to remove and resolder on the other side, but should have been thought about a bit better .Pity the backlight brightness control potentiometer is on the side towards the LCD.
Not so convenient when you have the LCD and backpack module close-coupled.
I2c has other speeds as well.I2c has two speeds for PiCAXE 100 or 400 KHz