[gbraad]

The A4000T looked too much like a commodity machine (cost-cutting measure?). It felt very different from the rest of the Amiga line-up. Especially, as the A3000T looked more like a Unix workstation and did not have the baydoor. I did see them advertised in CU Amiga, but they were too expensive. It was aimed at the higher-end due to the inclusion of an internal SCSI interface, and plenty of space to have VideoToaster and disks installed. However, most A4000s I worked on/seen, were all the regular desktop case.

https://en.wikipedia.org/wiki/Amiga_4000T states the following about the case:

""" The case itself was a re-purposed PC case which is evidenced by the presence of the Turbo button whose function in A4000T was to disable the internal speaker """

https://bigbookofamigahardware.com/bboah/product.aspx?id=31 states:

""" The A4000T from Commodore only saw a limited production of machines (estimated at 100-200) before they went bust in 1994, most machines never made it to the market but ended at third party developers and the local Commodore companies. A recent BBoAH study (2013), indicates that the number machines still existing is VERY low (only a handfull of named owners has been found so far).

In an email from 1996 send from Peter Kittel to a german A4000T user, Peter wrote "that only ~35 Machines got deliverd WORKING to customers, ~35 where NOT working. All in all only ~70 machines left Commodore for customers." That would explain why it is so hard to find somebody owning such a machine. For this reason the Commodore Amiga 4000T is considered the rarest commercial available home computers ever made. """

[classichasclass]

The later non-Commodore A4000Ts in TFA, however, are much better systems IMHO than the original Commodore-badged one and far easier to get. I've got one here too, with a QuikPak '060, Picasso IV RTG and Ethernet, and it runs very well in AmigaOS 3.9.

[TheAmazingRace]

The only thing about the ESCOM and QuikPak Amiga 4000Ts that were not great were the floppy drives, which I’m told were modified PC floppy drives. They worked, but weren’t the most reliable either.

[rasz]

Modified to spin at half speed, that was the only way to make Amiga read HD floppies with its 9 year old never updated floppy controller.

[TheAmazingRace]

Honestly, I’m amazed it took Commodore so long to properly support high density floppies. I’m pretty sure they stuck to the double density 880K GCR format right up to the 4000 series Amiga. Meanwhile, Atari was supporting high density media in some capacity as early as 1990 in their higher end systems.

[fractallyte]

I have a 4000T in an Eagle case.

This version: https://amigaland.de/eagle-4000te

It provided a lot more space for peripherals, and (for the time) looked better than the stock A4000T (in my opinion).