Hmmm, lets see here...
2 SVD 1.0 - Minor scratches, 3yrs
1 Cartel Mechanical Brass - One Ding on bottom, 3yrs
2 Nemesis Mechanicals - Dinged and scratched like crazy, being clones I expected them to take abuse at work, 3yrs
1 Kylin Mech (Pisces Clone) - Scratched up like crazy, another work mod, 3yrs
1 Reo Grande - Bought Used, no scratches, 1 rebuild after first bought it, 3yrs
1 IPV3 Ver1 - Bought it used, was scratched up by previous owner who had it only 3 months, had to rescue it, 2yrs
1 Sigelei 150watt - Minor Scratches from wear - 2yrs
1 Sigelei 30watt Mini - Minor Scratches as it is my current carry to work mod, 1.5yrs
1 SVD 2.0 - No scratches as it stays at home on my computer desk, 1.5yrs
1 Provari 2.5 Mini - No scratches, sits next to the SVD 2.0 at the computer desk, 8months
1 Kbox70watt - Minor scratches around the top and bottom plates, 6months <-Bad Paint Job
1 Evic VTC Mini - Minor Scratches bottom, 5months
1 Kbox Mini (75watt) - Minor Scratches and peeling, 4months <-Bad Paint Job
Quality of the manufacturer's design has to be taken into account as well. Eleaf, Joyetech, Kanger, and several other low priced mods suffer drastically with daily abuse.