I have a bee plus - I steered away initially because of price - I tried a maclaren triumph and then a maclaren xt - and a baby jogger city mini (all sold on now)!
I do prefer the bee plus - it is different enough to warrant the price in my opinion and it does everything I want it too - rear facing and light - can use on public transport with ease - and is comfortable enough to use as an all day pram as well as the little trips for my child and myself.
If you are in a mainly urban environment - I really wholeheartedly recommend the bee plus if you can afford it (or find a way to raise the money to get one!).
My dc is 2y old by the way - it makes very light weight of pushing him - and it is plenty big enough! (I expect to still use it occasionally up to age 5y (for really long outings of 5miles+ or when dc is poorly etc)- and I have big children! (and I don't drive so we walk a lot!)
The big advantage of bee plus is it's easy to fold with seat in rear facing mode! Pushing a buggy with a toddler in can be tiresome - but the bee+ makes it a pleasure.
It also is very stylish and it's easy to "personalise" - for example - I just put the off white liner - and the breezy uv shade (silver) on mine and it looks beautiful (especially with a nice cheap Cath Kidston bagabottle pouch on the handlebar!).
If you have a few buggies around - why not give them all a nice clean, photograph them and put them on ebay (on "buy it now" to make sure you get a good price and be prepared to box and post them) to help raise the money for your new buggy - you might surprise yourself! (That is how I afforded mine in the end).
Sorry I haven't tried the M&P Sola - but it looks very nice - and great value. I heard it won't fold in rear facing mode - so if that concerns you, you might want to check on that. I think I personally wouldn't choose the sola - just because it won't fold rear facing - and also because it doesn't have the unique suspension that you get on the bee (which makes the bee feel as if it is bobbing along in water it is so cushioned, which must be comfy for baby - but also makes it a nice push - as it's easy on your arms too)!