i play a full set of gotz gut strings. all plain. they are around the same price as lezners. i really like them. curious as if anyone out there has tried both lezners and gotz to do a comparison (maybe i don't want to know so i don't know what i'm missing). they have stood up for almost a year and still going strong. pretty low maintenance. i play mostly bluegrass where i slap a bit. the low E gets a little flubby. overall i am happy with them but next set i'm planning on trying lezners (not sure if i go all plain or try the anima E and A).
i have 2 basses with a lezner G string, and one with a gamut D and G string. the lezner string visually is obviously not as nice at the gamut. the gamut has special winding process that you can clearly see and the string itself is more polished (literally) while the lezner is more of a brown color and slightly more rough to the touch. having said that, the sound and play ability of it is just fine. people say that the G string is the least problematic of the gut strings. im not sure if i would try a lezner D string, but the G string is a safe bet if you ask me.