I have quite a lot of experience with the 3 main manufacturers. Biotek, Metron & Rigel.
We have just replaced an original series Biotek 601 with the Rigel 277. 2nd choice would be the new 601 & last would be the Metron.
In reverse order.
The Metron is overly complicated, especially when using the additional software. User installed testing profiles are easily corrupted and the unit is quite slow.
The Biotek (Fluke-biomedical) is a good machine with no particular vices.
The Rigel wins for use because of its' grouping of tests to reduce power up / down cycles. Custom test procedures can also be saved. As quick, if not quicker than the 601.