I have the Garmin Astro and with my new pup, I'm VERY glad I purchased it because she's a runnin' fool!! They're very expensive, IMO, but worth it. Yes, they make it easier to see when your dogs pointing and how they're working the cover but not losing them is the main reason I own one.
FWIW, after I started using mine, I was amazed at just how far my pup will go and how quick she gets there. For example, we run small wildlife area by my house and before I got the Astro, I thought my pup was only 200-300 yards out when she was out of sight. My Astro showed her at 992 yards on our last trip (probably after some deer). Runnin' like that, I know it wouldn't take much to lose that little brown rocket...
As with all technology, I'm sure they'll come down in price quite a bit if you can wait 1-2 years. As for me, I didn't like forkin' over the $$ but I'd do it again now in a heart beat.
Good luck with whatever you choose!