I have two Shimano Trevalas I'm looking to sell.
I currently use the 6'6 right now to throw Irons, and it gets them out there really well for such a short rod, and It's a great size for the kayak. It's extremely light weight, an although I haven't landed a YT with it yet, I have no doubt in my mind it can withstand it. I've caught a 42# Striped bass and a Football Yellowfin tuna on it. The 7'0" is just as strong, but doesn't have the weight you need to throw Irons, its best suited for soft baits.
PS, Fighting fish is more fun on light tackle! Duh!
TVS70ML
SHM-0209 7'0''
1pc. Medium
Light Medium
Fast 20-50lb 55-135 G 5.25'' 12.0'' Fuji
Hardloy Tip+8
TVS66MH
SHM-0641 6'6''
1pc. Medium
Heavy Medium
Fast 50-100lb 110-240 G 5.25'' 12.0'' Fuji
Hardloy Tip+7
Videos on the Trevalas
http://www.youtube.com/watch?v=xmJRvgO4kv0