I have the Mini-Hobby Type 1:144 XXI U-boat. The material in the kit all has the Trumpeter labeling. The Type XXI kit seems OK, it appears to be almost an exact copy of the Revell Type XXI in 1:144 scale. It is meant for motorization, so there is a big honking access hatch cut in the side, and you get all the waterproof conatiners for motor & batteries, but no motor or electrical hardware. For display purposes, one will have to carefully blend in the large access hatch to the hull.
Tom Dougherty ( snipped-for-privacy@aol.com)