I have Deltas and entirely trust them not to come out of the ground in a strong wind.
However, back in April we came home a day early because of continuous strong winds. I wasn't worried about the pegs, but was concerned that my bell tent central pole was bending quite a bit. There were three tents in our group and the little polyester ones looked as if the fabric would rip from the guys, if the wind continued much longer.
I pitched all three tents and none of the pegs came out. My tent had about half Delta pegs, the reason being that I gave the other half to my brother who had forgotten to bring the ones I bought him. The smallest tent was pegged with ordinary pegs.
We also pitched 'bum into the wind', the only trouble being that the wind turned completely round. When that happens, there's no way you can repitch while it's blowing a gale. The bell tent probably comes into its own there because of its round shape.
The pegs are only one factor in pitching a tent securely. If the pegs are secure it just means that something else then becomes the weakest point.
(The only thing that ever defeated one of my Deltas was an over-enthusiastic friend who was trying to help me take my tent down, and tugged at the Delta from the wrong end until it split!)
------------- Sarah
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