There are a lot of good Trap guns out there ....but Browning makes a very solid gun / and the BT-99 is certainly high on a lot of shooters lists. I also like the older version - the BT-100 because it has a drop out trigger in it.
Like someone told you ...you can't shoot doubles or continental Trap with it / where you need a 2nd shell ...but that's the only limitation.
Ljutic, Krieghoff, Perazzi, Blaser, Kolar ...etc all make fine Trap guns ...or combo guns ....and if you're like most of us, over time you'll decide on a gun that just feels right - that you have a lot of confidence in, etc ...and it may very well still be the BT-99 you have now.
Personally, I don't recommend a BT-99 as a first Trap gun ...because of its one shell limitation / and I think the Browning XT is a little more versatile because its an O/U - but the BT-99 is a little less money.
BT-99 grade III / IV with adj comb lists at $ 2,700 - and in my area sells new for around $ 2,300. But its a very handsom gun ....
http://www.browning.com/products/cat...-comb-firearms
XT with adj comb lists for about $ 3,200 and sells for around $ 2,900 ...
http://www.browning.com/products/cat...-comb-firearms
Also a very handsom gun ....
You made a very good choice ...and the BT-99 is a gun that will stay in your family for easily 3 or 4 generations if you take care of it. Just enjoy it and shoot it !