You'll find specs for the BurgessTMB planetary EPs here:
http://www.burgessoptical.com/EPs/EPSpecs.html
I have the 4, 5 and 7 mm bought on the 3/2 offer. Still, even at around $150 each they represent good value. A good ortho or plossl might just shade them on planets but not by much.
The ER and 60 deg. AFOV are big points in their favour.
Mark.