I turn a wrench from time to time at my LBS when the owner is short a mechanic plus I help out the neighborhood kids after they've "wrecked" their BMX bikes and all that is on top of racing BMX for almost 20 years... I feel like I've seen and installed just about every u-brake ever made! That said, a u-brake is a u-brake, sure there a better quality ones like the PAUL Components RACER but it'll cost you 3x what your paid for the High Sierra.

As far as Suntour Roller Cams, yes they do look great, however you won't be seeing much of it as you're installing on the underside of the chainstay and if that wasn't enough a used one will set you back about what you paid for the bike. Roller cam brakes go all day on Ebay from $25.00 to $99.00 for a single used brake depending on condition. If you're interested, a NOS one is up for action with $19.99 bid with $5.00 shipping and 4 days to go, you just might get lucky!!!

When you get a chance, I'd like to see some photos of your 1988 High Sierra. I picked up a 1988 High Sierra for my wife to use as a Farmer's Market bike and a grocery getter. Her bike had roller cam brakes front and rear, unfortunately it was the yellow model not the much cooler black chrome, but it did have a fillet brazed head tube. I robbed the roller cam brakes for my 1982 Diamond Back California Klunker. I had to do a fork swap and a cantilever brake up front with an old Odyssey u-brake from the spare bin.

Here are a couple photos of High Sierra grocery getter and my '82 D.B. Cali-Klunker:



(please forgive the progress photos of the High Sierra, for whatever reason the finished ones won't load)