Dave,
I love them but....Ive no clue if they are "worth the extra money". I just wanted to try them and I am this fall.
Depending on what you want to put up front, weight wise you may find what I did.
On my 55lb bow, shooting heavier heads, the Sitka just flat wasnt enough and the Alaska is almost too much but that was with longer shafts than what you will need.
If shooting a standard head, the Sitkas should work ok and at 28 inches you might be able to load the front a little. Others here probably have tried that.
I know they are "rated" for that weight but not if you're going to load them up any. At least not for me out of a Super K.
Id pick up one or two or hit the "garage sale" on ABS for seconds so you dont sink tons in them to find out what will work.
START LONG, regardless of what works for me. Once cut.......well, you know..lol