I got mask just awhile back, around 2m XP since ibis increase.. At about 4m now and I find it really difficult to do plunder without wanting to sui irl sometimes. Hardly getting 500k/day
I don't mind it some days, just depends on what I'm in the mood to train.
The set came out when I was around 80 thieving and still didn't get my first piece until 98. But nowadays I'll see people who aren't even 99 with the full set + SOTG. Just shows my bad luck, lol.
Think I've always used row/still do; I've even been tempted to just do Sceptre runs until I get it then loot rooms 1-3, but I figure I need the extra XP in the long run.