Official TomTom SD card for trucks

My trusty TomTom910 is soon to be replaced, im thinking of getting a 5150, but when i looked at a few various stores, i found this on ebay
ebay.co.uk/itm/Genuine-TomTo … 2a37259fd2

is it worth getting a cheaper model, then buying one of these and putting it in? Surley it will save me a £100 or more if i did it this way. Or should i just get a 5150?
I dont want a Garmin or a Snooper or anything else, and i dont want to download something off the internet an go thru all the malarkey of messing about with that. I want to keep it all 100% TomTom. Im not overly bothered by the price either.
Just want to know if these SD cards are any good with a cheaper TomTom model?

viewtopic.php?f=2&t=109849

Downloading it free isn’t a problem, but IS time consuming, however if that’s not what you want, then my advice about the 5150 is the way to go.

Thanks Ken, i have replied on the other thread, a 5150 is the answer i think.
Thanks again for your help.

My pleasure.

Ken.