Some observations of the G10C in my 1969 Fender Princeton Amp as compared to a few other speakers:
FYI - I just got this speaker installed this week and have spent only a few hours swapping and comparing... enough to draw some basic conclusions, but not a fully extensive long term review/comparison.
WGS G10C
The moment I pugged in and stummed one big chord, I knew this was a great speaker. Bold, Powerful, Punchy, Bright are all words I would use to describe this speaker in the princeton. It is loud, had a really solid and big sounding low end for a 10" speaker and lots of sparkle on the top end. It's somewhat scooped sounding, but has more mid presence and warmth than It handles being pushed well, and takes overdrive/boost pedals well too. Here's how it stacks up against the others:
Jensen C10Q
These speakers are voiced very similar in my observation, with the G10C being a louder, bolder, but also slightly warmer version. The Jensen has a nicec clean / tight bottom end, but no where near as big and bold sounding as the G10C's bottom end. It is slightly more scooped sounding than the G10C in that is doesn't have quite the warmth or mid-range presence that the G10C has, especially when pushed. The highs are sparkly and clean and comprible in both amps. The C10Q has a classic sound for a Fender, but I would advise anyone to choose the G10C over this particular Jensen. Because of the similar voiceing, I just feel that the G10C is simply a better version of the Jensen C10Q
Tone Tubby 40/40
I've had this speaker in my amp for nearly 3 years now, so I am very familar with it and love it for what it does. The Tone Tubby is smoother overall and softer in the high end comparede to the G10C. It has more mids and is generally a bit darker voiced all around. The bass is big and bold on both of them. It's not as clean and sparkly as the G10C, but its still articulate. It just seems to have a different EQ to it. The Tone Tubby sounds fantastic when pushed to the extreme. There is almost no need for any EQ adjustments at louder volumes or when using Overdrive/Boost pedals, while I found that I needed to adjust the EQ of the G10C as I cranked the volume and pushed it. Not really a big deal, because once EQ'd properly, they both handled the abuse quite well. Simply an observation. One advantage I found in the Tone Tubby as opposed to the G10C when really pushed was the low end. The Tone Tubby stayed the same even when maxed out, but the G10C started to get a bit fuzzy sounding. An EQ change helped this, and this was at FULL Volume on the amp, the guitar and boosted, so not a big deal, but worth noting. My guiss is this is also coming from the amp itself and not just the speaker... One distinct advantage of the G10C over the Tone Tubby is that ability to get more sparkly clean which can help out very warm and round sounding guitars as well as cut through a bit more. The G10C is more "fendery" for sure. I can't say one speaker is better than the other. Just different flavors.
Oxford 10J4
This is the original speaker form this amp. I have had it out of the amp for 3+ years now, but thought since I am comparing, I should try it out again. It's actually quite a nice sounding speaker at lower volumes. It takes the amps EQ really well, and has a classif Fender scooped sound to it. It is generally brighter than the G10C and Jensen and no where near the amount of low end. It's also a good deal quieter than all the other speakers. Once you begin to turn the volume up and push with overdrive/boost pedals, the speaker just begins to get shrill and fizzy in the high end and fart out in the low end. While the speaker isn't terrible, I was immediately reminded why I took it out, and will be keeping it out of this amp.
Conclusions
I'm not going to sell the Tone Tubby just yet, but I am going to keep the G10C in the amp for a while and gig with it. Its more in line with what people think of an expect from a fender amp than the Tone Tubby and is just simply a superior "version" of the Jensen C10Q and completely stomps on the Oxford 10J4. The G10C is a seriously awesome speaker.
Now I need to compare it to a Weber 10F150, and I'll be able to sleep at night. ;)