Yes, at that price, by all means. At only $8 each, they are an awesome bargain.
I suspect then that someone dropped your valve on the hard concrete floor at Lowe's and misaligned the ball valve. (before you purchased it)
I'm assuming you were careful to not get any PVC glue anywhere near the seals? It's hard to tell when inserting the pipe and concentrating on the outside to see what's oozing around on the inside of the valve. If glue even touched the seals it may be enough to create a leak.
The True Union valves are minimum $30 and up and rarely available at a brick-n-mortar store. Which means you have to order on the internet, pay shipping, wait to recieve it, etc.
I've never had any problems with mine at all....and as you can tell, I've done some significant modifications to it.
thank you for the compliment
Kevin