Yep, Vyrthyr is the best! I have like dozens of this armor. This glitch really works! But remember, you have to be of a low enough level when you kill him. Sometimes he will level up with you. At first it's great since he gets more powerful but eventually his level is too high for you to dead thrall him even if you have the necromage perk and even if you were a vampire too.
Vingalmo, my other dead thrall, resently became too powerful for me to rase. I don't know if it happens with every thrall but at least these two seem to gain levels with you and eventually be too powerful so that you have to be careful they don't get killed in battle.
if your not that high of a level you can also try this....
If you own lakeveiw manor(if not get it from falkreath) (Hearthfire dlc required) build the house and the enchanters tower and cellar in both cellar and enchanter tower put the mannequins in them once that is done leave the house and go right back in the house the mannequin in the enchanter tower will have the gauntlents and in the cellar it will have the boots and chestpiece.every time you leave the cellar it will spawn on the mannequin and since you left the hosue it will spawn on the mannequin in the house aswell (keep switching rooms). be sure to be wearing the armor or this WILL NOT WORK!!!! this may be done infinitly aswell... this was found on accident and has been working ever since. this glitch is also a good source of money if your