A great album. It took me time to really enjoy it fully, but now it's done and it's one of the best KISS album. Sonic Boom was back to their classic meat & potatoes rock and Monster is a step ahead. Great guitars, powerful drumming, Gene's sounds amazing on bass and Paul's vocals are wonderful. There are no fillers, all songs are fantastic, and I recommend you download on iTunes the 13th song, Right Here, Right Now, an hidden gem.
If you're a KISS fan you won't be disappointed.