I've been interested in the DSE901, but have only seen them with the flat "whistle" tip, which I really don't want. Are they available with a round tip, or, can I just get round carts for M401, etc. and pop those onto the 901s? What's this about tip covers? I haven't seen "tip covers" on any of the dozens of e-cig product sites I've visited thus far...
Despite all my research (or perhaps because of it!), and reading the *excellent* Help-The-Noob posts, I'm still feeling quite overwhelmed.
So...this question is not so much about hard vs. soft carts, but asking: any round carts for 901s?
EDIT: @ILuvVaping - thanks for the HealthCabin tip; just noticed your comment after I posted my query! Here's the direct link to [a href="http://www.healthcabin.net/10pc-brown-empty-cartridges-round-mouth-piece-for-dse901-product-7300.html"]round 901 carts[/a]
Still, my other question stands: can carts for other PVs be used interchangeably, e.g. 401 cart on a 510, etc.?