I’ve been using the Leigh D4R Pro Dovetail Jig for years.
I bought and used Leigh’s set of cutters/bits for the D4R.
https://www.leighjigs.com/cutters-d4.php
Expensive... But they’ve stayed sharp and cut/rout excellently.
For other router needs, I prefer Freud 1/2” shank carbide bits.
So I don’t know much about Rockler’s bits.
Having said that - For $50 - That Rockler set looks like a great deal.
The “trick” is: Will they “spec out” - Bit for bit, comparatively - With the Leigh D4R set.
If they do, I’d say: “That’s a ‘buy’”.
From Leigh’s web site:
5116-8 16-piece Boxed Bit Set for the D4R Pro and all 24" D-series Dovetail Jigs
Includes 8mm and 1/2" shank router bits: Through dovetail bits 50-8(1/4"), 60-8(5/16"), 70-8(3/8"), 75-8(7/16"), 80-8(1/2"), 90(11/16"), 100(13/16"), 140-8(5/16"), 150(7/16"), 160(1/2") and half-blind bits 80-8(8°), 101-8(10°), 112-8(12°), 120-8(14°), 128-8(18°). Also includes a 1/2" to 8mm collet reducer for 8mm shank bits (172-8), a 5/8" guide bushing for 1/2" shank bits (716C), and a FREE bit storage box.