Hey RW - we talked about this back in January so I'll re-use some of that discussion:
The CTE-100GT is the functional equivalent of a Conquest 100 (last generation - aka CQ00). The differences are:
CQ has a forged handle / TE-GT has a stamped handle
CQ has a forged drag star / TE-GT has a stamped star
CQ has clicking spool tension knob and drag / TE-GT has no clicks
CQ has a ported palm-side sideplate / TE-GT is plain/unported
I have both the CTE-100GT and a CQ00-100 and they perform and feel the same to me. These photos show the external differences:
NOW - to compare the CTE-100GT to the Conquest 2014/2015:
Conquest 14/15 has the same differences as mentioned above (forged, ported, clicks, etc.) PLUS has all the latest Shimano features and gizmos - X-Ship, micro-module gears, and SVS Infinity braking system, etc. The CQ 14/15 has a smaller sideplate and palms noticeably smaller than the CTE-100GT, it MIGHT (or might not) cast a bit farther due to the braking system, and will probably feel smoother to most folks due to the micro-module gears and X-ship. All in all, just a nicer reel than the earlier generation. Is CQ 14/15 enough better than a CTE-100GT to warrant buying a new reel? That's up to each person to decide...
Edit: I forgot to mention ONE more improvement in the new Conquest - the CQ15 "HG" geared model. Formerly, Shimano round reels were only available in a single gear ratio for each size. Now, Shimano is offering TWO ratios in the 100 and 200 size Conquests. The standard gear ratio gives about 23 IPT - approximately the same as the CTE-100GT. The new "HG" model, introduced this past summer, gives 30 IPT and really expands the envelope for the presentations that can be accommodated by the reel...