I have owned both telescopes. I first owned the TEC140 and then moved up to the
TEC160FL. I used the Losmandy G11, and the DM-6 mounts. My impressions were
based on several years of experience with both telescopes.
Pain to use- Not a pain for me but in a ScopeGuard case it is heavy. I should have opted
for rollers on the case. The 140 was lighter and easier to handle, but the
160 was a lightweight triplet compared to others. You need to be able to
lift 30 lbs or so, IMO. Not a pain for me, just more effort,
Miss 140- I NEVER missed the 140 after getting the 160
GoTo Az- Never had a need to mount another scope beside the 160. Occasionally I
set up my 130 refractor or my 102mm refractor on a Celestron CG5 ASGT
at the same time, especially at Star Parties.
Mewlon 210- Pretty much limited to visual, with long fl for narrow field compared to versatility of the 160 for visual high
power,, low power wide field, astrophotography etc. The good news is that the 210 has a manual focuser
instead of motorised like the 300. My choice would be the 160.
Obsession- Nice telescope, whole different ballgame. Your decision for your interests.
Yes, I did see a nice jump in performance with the 160 over the 140. I see/saw less of a jump viewing with the 180 over the 160. YMMV. I live in an area where I need to travel to find really good skies. The 160 always travelled well.
My DM-6 had encoders so I was the GoTo motor. It was a sweet combination. I recently sold my 160 because of
my advancing age and inability to get away to view. I do miss the wonderful views, but the new owner is very happy.
Hope this helps