I heard they used to have great products but not so much anymore and my experience is consistent with that. I haven't seen issues with their passive DC resistance products (shunts & resistance standards) but their electronic stuff seems to be a mess.
Measurements Intl, who I think sucked the talent from Guildline, has awesome hardware but just about all of it requires the use of their software. And their software, while powerful, looks like it was developed in the 90s and never updated.