We bought some of the first Critikon Compacts and had very bad reliability problems, some of which took literally months for Critikon to sort out. The new compacts look better made - but are still held together inside with double-sided sticky tape and jubilee clips !
We have bought a number of Welch Allyn units and the only problem has been with the actual NIBP cuff. The velcro fastener basically wasn't up to the job.
The staff like the Welch Allyn units and the stands are excellent.