I used these guys to rent gear for a MF Salmon trip in May two seasons ago, it was a mixed experience.
The Good: we lost an oar blade out of the back of my truck on the way up, some other boaters found it and returned it to Alpenglow (thank you again fellow boaters) - and we were never charged for the oar blade. They were also polite and had a well stocked shop.
The Not So Good: When we got to Idaho they charged us higher prices that we had been quoted over e-mail. I didn't bring in a print out of the e-mail and regretted it. They also promised us Icey-Tek or Yeti Coolers but gave us a Igloo Polar cooler instead (the kind they sell at Walmart for $50-60 Walmart.com: Igloo Polar 120-quart Cooler: Camping
) - the cooler worked just fine - but I could have bought the exact same cooler for the price of the rental fee. I had planned on renting a frame from them but borrowed a friends instead. Alpenglow wouldn't rent us oar locks or pins, to go with the oars we were renting from them, without also renting a frame - so I had to buy pins from them -it was $50-60 I wasn't planning on spending. I still use those pins so it wasn't all bad, I just didn't like that they would rent me oars with clips on them, but not the pins to go with them (or oar sleeves and oar locks).
I don't know if Alpenglow is under the same ownership or management now as it was then, and I don't know if my experience with them was the exception or the rule. If you chose to use them get everything in writing and bring it with you to Idaho.