Comparison of Tube Output CD Players

I wonder if anyone has had an opportunity to listen to, and evaluate, the following relatively comparatively priced CD players which all incorporate tube output stages:-

Jolida JD-100A

Audio Aero Prima

Unico CD

Audio Note 3.1x

The Jolida 100A is also available with quite a number of mods by the "Parts Connexion", by "Underwood HiFi", and by Verastarr which are apparently "factory approved" since the original warranty is maintained. If anyone could
comment about these mods I would be very grateful.