Paul wrote:

Were looking into a late June/July rafting trip down the Tuolumne.
And wanted to get suggestions on a reputable guide company. We were
looking into O.A.R.S and into ARTE. Does anyone have any comments on
either of these companies, or can recommend a good one.

All companies on the Tuolumne are good. They have to be, because it is
a fairly difficult river. Lots of rocks. Sierra Mac is the specialist
(most rivers have specialist companies that only raft on that river).
OARS also does the Rogue and MF Salmon. ARTA (note the A) is all over.

The difference between a good experience and a great experience is
probably more the result of your guides than the company. Pick a trip
based on the number of days you want to spend. 3-day trips are nice
because of side hikes, but can get expensive.