They've been...variable. This is the Mail on Sunday (online) one, had a +11 at the beginning of the campaign when the Tories were getting 20+ leads with everyone else, then when other pollsters had closed it to around 15 points, they had a +12, then this is the next in the series.
My feeling is that their panel is more politically aware than it should be and is accounting for the big swing, but a feeling is all it is.
Meanwhile, ORB has an increased Tory lead of 9 (from 6)
Dan Hodges is getting a fair amount of mockery for saying they'd all be herding.