I can vouch for Karl and his team. I attended his winch school last April and believe it was some of the best training I have ever received. If you've never winched launched, you've missed out on the most exciting way to get airborne. Eagle Field also offers off field landing experience, uphill, downhill and sloping as the runway is slightly hilly. Highly recommended for every glider pilot and you'll learn from the best. And if the winds cooperate you may get to do some ridge soaring.
Don (4 weak links) Grillo. F2