Yes they are worth it. They last a long long time.
Agreed. Rineharts have been my go-to choice for many years. I originally became a fan of Rinehart in the early 2000's. Although some of the early targets eventually wore out (or were destroyed by a bear), I've still got a couple of earlier generation Rinehart 3D targets (browsing deer, black panther) from the 2004-2006 timeframe. The foam on the bodies of the older model targets has finally dried out after almost 20 years, but I replace the inserts every couple of years so the bodies only matter for holding the inserts.
All of my targets are outside 365 days a year and are covered with grill covers when not in use. I have a number of the Signature Series and Woodland targets. I absolutely love the Signature Series targets, although they are pricey. The foam stays flexible for many years, arrow removal is easy and replacement inserts are easily obtainable. IMHO, buy once cry once.
For the Woodland targets, the inserts are the same foam and same quality as the Signature Series, but the bodies of the Woodland targets are lesser quality with a closer feel to Delta/MacKenzie. The bodies of the Woodland targets last a decent amount of time, but not any more than competing products. For example, I had a Woodland turkey target that only lasted three years before the target body would no longer hold the insert properly. The body dried out and was slightly misshaped after replacing the insert three times. The new insert would get knocked out each time I shot it, so that gave me an excuse to upgrade to a Signature Series Rinehart.
So, my advice is to go with a Signature Series Rinehart if you can afford it. If not, the Woodland series will do fine, but there are also competing products that will do as well (as mentioned by others in this thread).