(In my subjective opinion and in response to the TC as a watch of its own league)
TC was a good watch for its time; but then again, it came at a different price point and it's not like the TC was the only super-rep of its time: there were other super-reps back then with a cheaper price tag (notably, those Panerai). Not to mention, the TC had its fair share of bad QC and/or uncorrectable fatal flaws (e.g. tall SEL mid hump, non gen-spec SEL and/or lug hole location -- at least for the V6 and V7 that i currently own. Also, some of the TCs have notoriously-bad SEL gaps as well).
The SA4130 movement's chronograph functionality is not the only spotlight of the watch:
1. The SA4130 movement is compatible with genuine parts for franken builds / modding. Therefore, there is no need to cut off the genuine dial's feet or modify the wheels / cannon pinion (to make the movement accept genuine hands).
2. The SA4130 movement has the right thickness, unlike the following movements: Asian 7750 sec. @6 or the well-revered ARF 116520 (which has a slightly-more bulbous caseback to accommodate those decorative plates).
3. The SA4130 movement has the correct crown / stem / tube height like genuine, unlike the following movements: Asian 7750 sec. @6, the well-revered ARF 116520 (which has a higher crown height, ruining the crownguard shape when you look at it from the side), and JF 23j faux chrono movement (the crown height is too low and it affects the crownguard shape as well).
4. The SA4130 movement's pusher is made to gen-spec and this influences the aesthetics of the pusher location on the case, unlike the ARF 116520 V1 which originally had stubby pushers.
5. Modders, owners, and watchsmiths on RWI have praised the quality and reliability of the movement. As previously mentioned by Tickleshoes, he noted that even the quality of the reverse wheels is top-notch and manufactured like its genuine counterpart.
In a nutshell, the development of the SA4130 movement to be a 1:1 clone (of the genuine equivalent) not only brings us chronography functionality (like gen), but it also influences the aesthetic and construction of the case shape, as well as the compatibility of genuine parts for modders and enthusiasts.
Also, it doesn't hurt to own something different and unique from the current rep offering? I mean, NOOB CLONED A FREAKIN' COLUMN WHEEL CHRONOGRAPH MOVEMENT!!! If you look at the technical aspects and intricacies of the 4130 movement, then $658 is just a small price to pay for such a feat with the above-mentioned advantages.