I have come to really appreciate Stainless fermenters, too, but I appreciate the plastic ones, too - I have 2-7 gallon SS Brewmaster Buckets, 2-15 gallon Chapman SS tanks; 2-60L Speidel plastic fermenters and 2 Big Mouth Bubblers without ports. I brew 10 gallon batches, typically, but I can use the BrewBuckets, BMB's and regular 6.5 gallon buckets I have laying around on 5 gallon batches when in the process of ramping up some yeast to a 10 gallon batch pitch size...At any given time, I may have a couple fermenters full or all of them!
I don't typically worry about watching the fermentation, other than some airlock activity, if it happens to be in process. Pitching a load of healthy yeast means, it usually finishes pretty darn quick, so the show is over before I get back to checking, sometimes.