I've got a couple. I use one in side the other as a double boiler for making cheese which works wonderfully as its a massive amount of thermal mass.
I've also used them for my original 3V brewery where I used to split the boil over two pots on the stove. Now I'm just awaiting my 70L pot from Beerbelly
All In all they are great pots for liquid use. Dont try using them for making great loads of bolognese sauce though. I've tried and failed twice. the thin metal doesn't dissipate the heat and it just scorches (which is the reason why I use them in a double boiler arrangement for cheese making) and burns the crap out of the mince! A lot of elbow grease is required to clean it - the second time I did it I just went and bought another pot when they were on sale again and got rid of the one I ruined.
I think value for money entry AG gear (especially for small/split BIAB brews) you cant go past them to at least get you off to a running start. I wouldn't want to suggest any one try carrying one with hot wort around though as the metal and handles could break with a full load!
Having said all this - ally pots of 40L size can be picked up for about $60-$80 if you look to the right stores and might offer a better option to many - no point saving a but to make more work / less predictable results IMO - of course YMMV.