The fact you're asking shows you know not to believe evrything you read, good idea in asking here. You have trolls, people who would never buy but love vipers, owners who may buy the new gen or not, and gen5 current owners. Different groups post at different frequency.
As for negative stuff, most of it is over some less than stellar marketing decisions by SRT and not about the car itself. It's hard to argue that a record setting gen5 is somehow not a good car or worth the $ of cars performing at lower levels that cost significantly more .. if you're really looking at performance. Negative people tend to "talk" louder than positive, especially on the internet.
Is every single owner happy? Well, I'd say no, since we see used ones already and we know of at least one buy-back that was a bit ugly from a guy on these forums. But can you say that of any car in the world? I'd bet the "happy" statistic is WAY higher than other cars in it's class, the unhappy experience is extremely low in vipers in general, and for the gen5 I'd say with the improvements, this is even more the case.
What's not to like really, record setting road racer, low 11 sec strip time for TA already achieved by mags, 200+ top end, lux style interior fitting of any exotic, killer looks, bad-ass reputation, state of the art electronics now, where is the unhappy component? As a multiple viper owner over the past 15 yrs, I've consumed my share of SRT cool-aid, so I know I'm positively slanted, but none of these points is very arguable, maybe looks, but I think 98% would agree on how awesome the TA looks.
Is it worth it? Very personal question. I DO think the TA is worth $120K. I DON'T think a GTS is worth $140k, but that's because the stuff it buys you isn't my priority, others will strongly disagee with me. At $90k the viper is a crazy deal, but that's not a TA, and it's about what you really want.
So, you say, with all that positivity why isn't my order in yet? I want to see resolution to the "pulling power" issue that some of the guys are working with SRT techs on. I do track my cars, open track and strip, so I need to know it's not going to power down from a burnout, etc. And although I love the look, it's not a color I'd buy, in terms of the TA colors offered. Right now, I'm diggin the silver. Since the race car is silver I don't know why they didn't use that as one of the TA colors, but whatev's. So I'm an active shopper I guess, waiting on some dust settling myself. But buying a TA, IMO, is worth it at MSRP for sure, personally I'd not pay a market adjustment but that's not a viper thing, I wouldn't do that for any car, that's just me.