Finished and based a unit (2 BLB squadrons) of Timarli Sipahi, figures by Warfare Miniature.
Excellent miniatures, very dynamic and easy to paint (no really!) The riders all have long firearms to attach to their backs which locate nicely with a lug to a small - in the cavalryman. I had read that there was resistance by Ottoman cavalry to firearms but this may be a Western misapprehension.
These join my other 4 squadrons which are my own castings on Warlord plastic horses.
There is no real information about uniforms for this period; not in the regular/guard Kapikulu units and certainly not for the provincial Sipahi cavalry. This allows me to choose a mix of schemes, some units in similar colours some in a complete mix. This will work okay for the successor cavalry to the Sipahi once they pretty much disappear in the mid 1700s.
For the Vienna to Great Northern War period I am going to rate Sipahi as relatively competent. Maybe not as dangerous as previous times (and described as "useless against regular European troops".) However they are still great individual horsemen and relatively keen. No armour at this time and probably no use for the mundane tasks such as picquet duty and scouting but there are lots of other cavalry who can carry these out in an Ottoman force.
This makes 14 BLB squadrons (7 Piquet units) now painted. The infantry need to catch up a bit, next up Azabs, Albanians and some more Janissaries.