Tikka is made by Sako. It is their budget line. I've been told the barrels are the same but cannot confirm that. They tend to be very accurate and are among the lightest hunting rifles you will find. They were one of the 1st manufacturers to use an enclosed top action making the action stiffer, and more accurate than conventional rifles. The triggers tend to be very good and are user adjustable down to around 2-2.5 lbs. At least mine are. I've owned, and still own a few and have friends and relatives with some. Never seen one that wasn't a tack driver.
I think they are one of the best buys in a sub $1000 rifle. They aren't fancy, just rugged, accurate working rifles at a reasonable price. Although the Ruger Americans at about 1/2 the price is probably as accurate. I have a slight preference for the Tikka though because I still feel the Ruger magazines are the weak link. And the Rugers are creeping up in cost getting closer to Tikka. Street prices on Tikkas are around $600 in blue, $750 in SS. I paid $350 for my Rugers, but they are $400-$450 now.
I've had a CTR in 308 for several years and a T1 in 22 LR for about 1 year. The 22 in particular is insanely accurate. It shoots even cheap ammo good and will keep 5 shots of quality ammo under 1" at 100 yards. Often well under 1" if there is no wind.
As far as negatives a lot of people don't like the modernistic styling and the detachable magazines are a turn off for others. But it is a much better magazine design than Ruger, they do work well. I find none of that a disadvantage.