the starts i have are usually about 15-20cm tall and already have some flower buds starting to appear. they usually end up getting to be about 50-60cm tall by the end of the season - i've never put supports in for them but they might do better if you do.
the fruits are not thick walled, but are what i'd consider medium thickness, about 8cm wide and 15-20cm long with a ridge around the top so if you get frequent rains you may have some water collect on the top.
quantiity in our heavy clay soil is plenty with two to three crops.
heat level is about the same as a jalalpeno.
flavor is different than jalapeno but good to me but they are certainly not hatch chilis or red pepper or green pepper flavor - unique to them i guess i'd say. if you want them to be milder (as usual with some hot peppers) you can remove the seeds and veins when prepping them.
as for a favorite, i like that they are productive in our garden soils when jalapenos are usually not very good for us.
the downsides are the above mentioned ridge and then with the long fruits and how deep i plant them they often are dragging fruits on the ground (they might do better with bigger starts but so far i'm not getting those from the greenhouse - since they are doing these as a favor to me i'm glad to get the plants at all - i don't have good pepper starting conditions here at home). to get bigger starts get them going a month or more earlier than usual?