What use to be my Siemens distributor was a very good company, still are but they switched to Modicon plc's. Anyway they sold Rittal and it was by far less expensive than Wiegman, Hammond or Hoffman. There wasnt any lead time involved, 2-3 day delivery was standard.
I had a small problem with one order involving pedestal mounted control boxes, the bases (threaded connection) didnt match with the pedestal bolt holes. The distibutor salesman brought the Rittal rep to see the problem and I had new matching bases in a couple of days.
Like anything it all depends on the company you buy from, sometimes you can find a local company that will build to standards and offer at a better price.