I absolutely adore Tchaikovsky in all his various incarnations, and on this disc he'll blow you away.
In respect to the 1812 Overture, Erich Kunzel made a wonderful choice including the choir, and the cannons are incredible, especially on the right equipment, as another reviewer exhaustively explained. Apart from 1812 Overture, there are plenty of treats from the well-known Polonaise from Eugene Onegin to the lesser-known Cossack Dance (a real treat) and the Festival Coronation March (some signature Tchaikovsky bombast).
You will not find a better engineered recording of any of these pieces, however I believe that Capriccio Italien and Marche Slave have been better-played in a variety of places. Kunzel is just too free with the tempos, and the whole concept of a march is somewhat lost. On the cannon end of things, it seems that Kunzel has arranged the blasts from worst to best as the piece progresses. The first much-anticipated cannon shot is a letdown in that it sounds like you dropped a metal trash can lid. However, by the time we reach the end, there has been one shot that sounds incredibly like a cannonball flying inches above your head and the final shot which resonates like the planet exploded.
Overall this disc is wonderful, especially if you have the right equipment, but a better choice for the typical CD player (the cannons and the bells seem to have more of a raw oomph! to them) is Antal Dorati's 1950s recording with the Minneapolis Symphony Orchestra on the Mercury Living Presence label. Somehow, there is something in Dorati's interpretation that doesn't need today's fancy equipment to make it sound fantastic. Buy Kunzel's and buy Dorati's and decide for yourself. My choice is Dorati, but Kunzel is a very close second.