Tell me about SafeGuard... I've never seen one of those either (I live out in the boone docks ya know!) Do they come in pink?
They don't come in pink, but I tell you this:
it does not matter. They do come in red, which is nice.
The covers are not plush but a very soft microfiber. There is scads of memory foam under the cover, all over, for superior comfiness. My kids ADORE the comfiness of this seat.
As for install, it's super, super, SUUUPER simple. LATCH is what the Symphony SHOULD be-- in almost all vehicles with LATCH it practically installs itself. Seatbelt install with lap/shoulder belt is a cinch due to the absolutely easiest ever lockoffs (rather like those in the Keyfit's base, you simply pull the belt tight, and then slide the belt in to the lockoff. Done.) Lap only belt is not as much easier than other seats but only because lap-only belts are sooo easy to install with most of the time.
Adjusting the harness is a dream. You just lift and pull to go up and down. Tightening, you pull the yellow lever to get most of the slack out, then it has knobs (kind of like the ETA's but easier to use) to tighten up the rest of the way.
It does have a few drawbacks. It's not as wide or deep as the Regent. But even my long-legged gal doesn't seem to care, because of the angle of the seat, I guess, and the memory foam. Its width is not much wider than other seats, so I guess that could be a problem if you don't have skinny kids, and it only goes to 65, not 80 lbs. (though I think 80 in the Regent is unrealistic for many kids, there are some who need it.)
But, it is soooo easy to fall in love with this seat. I have two-- because I bought one, and needed another for my other child. I love them that much.