I own 2 of the 16 X 18 versions and I just purchased an O3 Speedport Tour and had it strung with the small hole grommets. Honestly, I really like the standard Hybrid Tour. I read the not so positive review in TW and took their advice and strung them with a poly (BB Ace 112). I normally use this string combined with natural gut in my racquets. The BB Ace works really well in the Hybrid Tour, because I can string it tighter than most poly's and it still maintains some softness.
I have read in these threads that everyone really prefers the 18 X 20 version, but I have never had the opportunity to try it. Mine gives me a lot of accuracy with my serve and I don't seem to have much of a control issue on groundies. It also adds more feel than most O3 racquets.
As for the Speedport Tour, I had never given it any consideration until very recently. I have been playing with another brand, but have finally come to the realization that these are a little too demanding when I don't have my best game. A lady at our club actually encouraged me to try it. I like heavier racquets for their stability, but I needed a midplus, so I took her advice. This is a very solid racquet that does everything well for me. It is very accurate and I am controlling it very well. It has more pop than what I was using, but I strung it @ 62 lbs. in the mains with natural gut and 58 lbs. in the crosses with BB Ace 112. I agree that even though the power rating is higher than the Hybrid Tour, the Speedport doesn't seem to have quite as much power.