Except for one occasion I've never found punctures on tour to be a significant problem - however, if you are out in the open and it is 40° or it is raining heavily then it can be not that pleasant - plus a puncture at the end of the day can make the difference between getting to where you want to be in daylight or the dark.
- I started off using the old conti -top touring - good tyre which wore reasonably well and I never never really had that many punctures when they were reasonably new -but tended as the F1 chappies say go over the cliff
- then Pasela -which I found wore too quickly - both the tread and the side wall - only tyres I have ever had to change because the side walls had failed
- replaced on tour with some Kenda touring tyres - did what it said on the tin but the only set of tyres that I have owned that i noticed the weight
- replaced with standard kevler marathons - both tyres rendered unusable for future tours in the single incident with the thorns
- replaced with Marathon plus - never really noticed they were heavy and did the thick end of 10k on them in a single tour without a single puncture - and still a lot of life left in them