It will take longer to boot up and load applications you would've put on the SSD, but nothing other than that. I had a 7200rpm drive in my laptop at first and then added an SSD later on
I see,,, well my desktop has a 7200rpm HDD and it's not really that slow to boot up, about 1 min? which is really fine for me.
Would there be a BIG difference between an SSD and an HDD?