I love briggs- they are fantastic! So are rams horns and Malaysian Trumpets. I have all three plus some pond snails and the Briggs give the the best coloration and the best "scavenging" skills. They cleaned my diatoms up, and I have none now. I know that diatoms go away on their own, but the snails did a great job. If you can find it, dixienut is giving 10 briggs free, her choice if you pay shipping. I know this is a plug, but she is the one I got most of my snails from (not the pond snails lol), and the briggs and MTS I got from her are great. I have no dead loss and they are getting bigger and bigger. Good Luck and I hope you find some snails you like!!
Maribeth
P.S. Check out my 55 gallon community tank pictures and you will see the snails I got from her!!