You get what you pay for.
I work as a panelbeater in Melbourne. Bought some stuff off Viva last year after a had a little car accident in my 32.
Im halfway through doing a widebody on my car using Viva garage front guards, Uras sideskirts, Uras rear bar. I bought the rear quarters, Do-luck front bar and fibreglass bonnet somewhere else. The bonnet I had didn't line up to the guards and the guards didn't line up properly with the doors. The sideskirts were meant to be flat but had massive ripples through it which I've had to use heaps of body filler to straighten it out. It has been a real headache to get the parts to fit nicely. I'm currently up to doing the rear bumper which I've left till last because it looks like the most work - gaps under tailights are big on one side and small on the other, the bar is wavy as all hell and the bar ends barely wrap around the quarters even after forcing it and cracking the upper edge.
My mate just bought a carbon fibre C-West Copy S15 bonnet which set him back a little bit of cash but it still ended up being slightly cheaper than bonnets from other places. He also ordered an S15 M-sports front bar, S14 Uras skirts, S14 Uras rear bar and Viva's wider rear quarters. He bought the front conversion guards from Top stage. The only thing that fit well straight up on his car were the side skirts and the guards. Everything else was a really time consuming to get it right and even then its not perfect. ie. front bar has huge gaps under the headlights and doesn't line up to the bonnet. Rear quarters were not the exact same shape on both sides. Rear bar is wavy as hell and keeps cracking on the corners where it wraps around the metal part of the quarters.
End of the day, I needed parts to fix my car and make it look a bit better but I didn't have a lot of money and I tried to save cash by buying cheaper products from Viva. I couldn't afford the time to send the kit back and wait for a refund or whatever as my car was off the road and it was my only form of transport to work which was 30km away. I knew their parts wouldn't be the best but it really astounded me the amount of time I have to spend fixing "new" parts. It would cost way too much paying someone else to try and fix it. It's not until now that I realise that I could have saved a lot of time and effort in the first place by spending more money on the kit in the first place. If you don't mind having a car with a kit thats cheap, nasty and has gaps and fits like a loose crack ho, then the parts aren't a real problem. If you really love your car, I would get your stuff somewhere else and you'll save in the end.
BTW Viva S14 Uras side skirts fit really well!