We use the triplex mower and a 25" TruCut. 75% of the lawns are large enough to use the triplex, and we will finish the outline with the TruCut. We do a veterinary clinic and a regional bank that have islands and obstacles as well, and the triplex is more hassle than its worth in those areas.
We backlap in house, once before we scalp, after we finish scalping for the spring, then every other month depending on how it cuts. We haven't had a need for actual sharpening of the reel blades, backlapping has kept them cutting great.
Greendoctor, thanks for the compliment! I wish more professionals around here would use reels.