I doubt the Jet comes with a blade but am not certain. If it does, odds are good that's a mediocre blade.
The Freud GLR will do what it claims, but it's wise to be aware of what it'll do and won't do. It'll rip a fairly clean edge in stock to ~ 1" thick, but isn't designed to cut stock thicker than that efficiently, and the full kerf will work against you beyond that thickness. It also won't crosscut too well. Most good 40T or 50T general purpose/combo blades will rip just as cleanly, will handle slightly thicker materials, plus will crosscut much better. So the GLR is a good choice for dedicated ripping in moderately thick materials, but if you want a blade for a wider range, this isn't it.
If you're just looking for a decent all purpose blade as a backup to your WWII, there are lots of inexpensive choices, and plenty of more expensive choices. The LU86R010
40T TK is a great bargain and a good blade in it's own right....~ $31.50 shipped from Amazon. The Tenryu RS25540 mid-kerf is about the same price from Holbren. If you want a blade that'll cut a bit cleaner than your WWII, try the LU88
...excellent crosscuts, and very clean rips to ~ 6/4"....~ $40.50 shipped from Amazon. If you'd like a blade that'll handle some thicker stock, the WWII 30T
is really slick...it'll glide through stock with the ease of a good 24T ripper but will cut nearly as cleanly as the 40T WWII....it's closer to ~ $80. The Infinity Combomax
Lite is top notch 50T combo blade at ~ $65.
Blade choice is always a matter of opinion, but that's my 2 cents...